diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 5d23e5f..1614801 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -21,10 +21,10 @@ jobs:
     env:
       BROWSER_STACK_ACCESS_KEY: $(BROWSER_STACK_ACCESS_KEY)
       BROWSER_STACK_USERNAME: $(BROWSER_STACK_USERNAME)
-      BUNDLESIZE_GITHUB_TOKEN: $(BUNDLESIZE_GITHUB_TOKEN)
+      BUNDLEWATCH_GITHUB_TOKEN: $(BUNDLEWATCH_GITHUB_TOKEN)
       SAUCE_ACCESS_KEY: $(SAUCE_ACCESS_KEY)
       SAUCE_USERNAME: $(SAUCE_USERNAME)
-      TEST_BROWSERS: 'ChromeHeadlessNoSandbox,FirefoxHeadless,sl_ios_safari'
+      TEST_BROWSERS: 'ChromeHeadlessNoSandbox,FirefoxHeadless,sl_edge,sl_safari,sl_ios_safari,bs_android_chrome'
 
   - task: PublishTestResults@2
     displayName: 'Save test results'
diff --git a/karma.conf.js b/karma.conf.js
index 5da5aa9..e67b212 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -71,44 +71,60 @@ module.exports = function (config) {
       XXXsl_chrome: {
         base: 'SauceLabs',
         browserName: 'chrome',
-        extendedDebugging: true
+        extendedDebugging: true,
       },
-      sl_firefox: {
+      XXXsl_firefox: {
         base: 'SauceLabs',
-        browserName: 'firefox'
+        browserName: 'firefox',
       },
       sl_edge: {
         base: 'SauceLabs',
-        browserName: 'MicrosoftEdge'
+        browserName: 'MicrosoftEdge',
+        version: '79.0',
       },
       sl_safari: {
         base: 'SauceLabs',
-        browserName: 'safari'
+        browserName: 'safari',
+        platform: 'macOS 10.15',
+        version: '13.0',
       },
       sl_ios_safari: {
         base: 'SauceLabs',
-        deviceName: 'iPhone X Simulator',
+        deviceName: 'iPhone 11 Pro Max Simulator',
         platformName: 'iOS',
-        platformVersion: '11.2',
+        platformVersion: '13.0',
         browserName: 'Safari',
-        appiumVersion: '1.9.1'
+        appiumVersion: '1.15.0',
       },
-      sl_android_chrome: {
+      XXXsl_android_chrome: {
         base: 'SauceLabs',
+        deviceOrientation: 'portrait',
         deviceName: 'Android GoogleAPI Emulator',
         platformName: 'Android',
         platformVersion: '7.1',
         browserName: 'Chrome',
-        appiumVersion: '1.9.1'
+        appiumVersion: '1.15.0',
+      },
+      bs_android_chrome: {
+        base: 'BrowserStack',
+        os: 'android',
+        os_version: '10.0',
+        browser: 'android',
+        device: 'Google Pixel 4',
+        real_mobile: true,
       },
       FirefoxHeadless: {
         base: 'Firefox',
-        flags: ['-headless']
+        flags: ['-headless'],
       },
       ChromeHeadlessNoSandbox: {
         base: 'ChromeHeadless',
-        flags: ['--no-sandbox']
-      }
+        flags: ['--no-sandbox'],
+      },
+      ChromeCanaryHeadlessNoSandbox: {
+        base: 'ChromeCanaryHeadless',
+        flags: ['--no-sandbox'],
+      },
     },
     sauceLabs: {
       // Since tags aren't being sent correctly, I'm going to stick the branch name in here.
@@ -121,7 +137,7 @@ module.exports = function (config) {
       tags: [ISSUE],
       recordScreenshots: false,
       recordVideo: false,
-      public: 'public restricted'
+      public: 'public restricted',
     },
     concurrency: 5,
     // Continuous Integration mode
@@ -138,8 +154,10 @@ module.exports = function (config) {
       devtool: 'inline-source-map',
     },
     plugins: [
+      'karma-browserstack-launcher',
       'karma-chrome-launcher',
       'karma-edge-launcher',
+      'karma-ie-launcher',
       'karma-safari-launcher',
       'karma-firefox-launcher',
       'karma-jasmine',
diff --git a/package-lock.json b/package-lock.json
index 6a86ff2..80d0b96 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -413,13 +413,30 @@
       }
     },
     "accepts": {
-      "version": "1.3.5",
-      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
-      "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
+      "version": "1.3.7",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
+      "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==",
       "dev": true,
       "requires": {
-        "mime-types": "~2.1.18",
-        "negotiator": "0.6.1"
+        "mime-types": "~2.1.24",
+        "negotiator": "0.6.2"
+      },
+      "dependencies": {
+        "mime-db": {
+          "version": "1.43.0",
+          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.43.0.tgz",
+          "integrity": "sha512-+5dsGEEovYbT8UY9yD7eE4XTc4UwJ1jBYlgaQQF38ENsKR3wj/8q8RFZrF9WIZpB2V1ArTVFUva8sAul1NzRzQ==",
+          "dev": true
+        },
+        "mime-types": {
+          "version": "2.1.26",
+          "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.26.tgz",
+          "integrity": "sha512-01paPWYgLrkqAyrlDorC1uDwl2p3qZT7yl806vW7DvDoxwXi46jsjFbg+WdwotBIk6/MbEhO/dh5aZ5sNj/dWQ==",
+          "dev": true,
+          "requires": {
+            "mime-db": "1.43.0"
+          }
+        }
       }
     },
     "acorn": {
@@ -437,6 +454,13 @@
         "acorn": "^5.0.0"
       }
     },
+    "addressparser": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/addressparser/-/addressparser-1.0.1.tgz",
+      "integrity": "sha1-R6++GiqSYhkdtoOOT9HTm0CCF0Y=",
+      "dev": true,
+      "optional": true
+    },
     "adm-zip": {
       "version": "0.4.13",
       "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.13.tgz",
@@ -492,6 +516,56 @@
       "integrity": "sha1-6GuBnGAs+IIa1jdBNpjx3sAhhHo=",
       "dev": true
     },
+    "amqplib": {
+      "version": "0.5.5",
+      "resolved": "https://registry.npmjs.org/amqplib/-/amqplib-0.5.5.tgz",
+      "integrity": "sha512-sWx1hbfHbyKMw6bXOK2k6+lHL8TESWxjAx5hG8fBtT7wcxoXNIsFxZMnFyBjxt3yL14vn7WqBDe5U6BGOadtLg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "bitsyntax": "~0.1.0",
+        "bluebird": "^3.5.2",
+        "buffer-more-ints": "~1.0.0",
+        "readable-stream": "1.x >=1.1.9",
+        "safe-buffer": "~5.1.2",
+        "url-parse": "~1.4.3"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true,
+          "optional": true
+        },
+        "readable-stream": {
+          "version": "1.1.14",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.1",
+            "isarray": "0.0.1",
+            "string_decoder": "~0.10.x"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
+    "ansi-colors": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-3.2.4.tgz",
+      "integrity": "sha512-hHUXGagefjN2iRrID63xckIvotOXOojhQKWIPUZ4mNUZ9nLZW+7FMNoE1lOkEhNWYsx/7ysGIuJYCiMAA9FnrA==",
+      "dev": true
+    },
     "ansi-regex": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
@@ -701,6 +775,13 @@
       "integrity": "sha1-WWZ/QfrdTyDMvCu5a41Pf3jsA2c=",
       "dev": true
     },
+    "ast-types": {
+      "version": "0.13.2",
+      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.13.2.tgz",
+      "integrity": "sha512-uWMHxJxtfj/1oZClOxDEV1sQ1HCDkA4MG8Gr69KKeBjEVH0R84WlejZ0y2DcwyBlpAEMltmVYkVgqfLFb2oyiA==",
+      "dev": true,
+      "optional": true
+    },
     "async": {
       "version": "2.6.1",
       "resolved": "https://registry.npmjs.org/async/-/async-2.6.1.tgz",
@@ -746,14 +827,26 @@
       "integrity": "sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==",
       "dev": true
     },
-    "babel-runtime": {
-      "version": "6.26.0",
-      "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
-      "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+    "axios": {
+      "version": "0.15.3",
+      "resolved": "https://registry.npmjs.org/axios/-/axios-0.15.3.tgz",
+      "integrity": "sha1-LJ1jiy4ZGgjqHWzJiOrda6W9wFM=",
       "dev": true,
+      "optional": true,
       "requires": {
-        "core-js": "^2.4.0",
-        "regenerator-runtime": "^0.11.0"
+        "follow-redirects": "1.0.0"
+      },
+      "dependencies": {
+        "follow-redirects": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.0.0.tgz",
+          "integrity": "sha1-jjQpjL0uF28lTv/sdaHHjMhJ/Tc=",
+          "dev": true,
+          "optional": true,
+          "requires": {
+            "debug": "^2.2.0"
+          }
+        }
       }
     },
     "backo2": {
@@ -877,6 +970,18 @@
       "integrity": "sha512-DYWGk01lDcxeS/K9IHPGWfT8PsJmbXRtRd2Sx72Tnb8pcYZQFF1oSDb8hJtS1vhp212q1Rzi5dUf9+nq0o9UIg==",
       "dev": true
     },
+    "bitsyntax": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/bitsyntax/-/bitsyntax-0.1.0.tgz",
+      "integrity": "sha512-ikAdCnrloKmFOugAfxWws89/fPc+nw0OOG1IzIE72uSOg/A3cYptKCjSUhDTuj7fhsJtzkzlv7l3b8PzRHLN0Q==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "buffer-more-ints": "~1.0.0",
+        "debug": "~2.6.9",
+        "safe-buffer": "~5.1.2"
+      }
+    },
     "bl": {
       "version": "1.2.2",
       "resolved": "http://registry.npmjs.org/bl/-/bl-1.2.2.tgz",
@@ -906,21 +1011,39 @@
       "dev": true
     },
     "body-parser": {
-      "version": "1.18.3",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.3.tgz",
-      "integrity": "sha1-WykhmP/dVTs6DyDe0FkrlWlVyLQ=",
+      "version": "1.19.0",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.19.0.tgz",
+      "integrity": "sha512-dhEPs72UPbDnAQJ9ZKMNTP6ptJaionhP5cBb541nXPlW60Jepo9RV/a4fX4XWW9CuFNK22krhrj1+rgzifNCsw==",
       "dev": true,
       "requires": {
-        "bytes": "3.0.0",
+        "bytes": "3.1.0",
         "content-type": "~1.0.4",
         "debug": "2.6.9",
         "depd": "~1.1.2",
-        "http-errors": "~1.6.3",
-        "iconv-lite": "0.4.23",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
         "on-finished": "~2.3.0",
-        "qs": "6.5.2",
-        "raw-body": "2.3.3",
-        "type-is": "~1.6.16"
+        "qs": "6.7.0",
+        "raw-body": "2.4.0",
+        "type-is": "~1.6.17"
+      },
+      "dependencies": {
+        "qs": {
+          "version": "6.7.0",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
+          "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==",
+          "dev": true
+        }
+      }
+    },
+    "boom": {
+      "version": "2.10.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
+      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "hoek": "2.x.x"
       }
     },
     "bottleneck": {
@@ -1045,6 +1168,60 @@
         "pako": "~1.0.5"
       }
     },
+    "browserstack": {
+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/browserstack/-/browserstack-1.5.3.tgz",
+      "integrity": "sha512-AO+mECXsW4QcqC9bxwM29O7qWa7bJT94uBFzeb5brylIQwawuEziwq20dPYbins95GlWzOawgyDNdjYAo32EKg==",
+      "dev": true,
+      "requires": {
+        "https-proxy-agent": "^2.2.1"
+      }
+    },
+    "browserstack-local": {
+      "version": "1.4.5",
+      "resolved": "https://registry.npmjs.org/browserstack-local/-/browserstack-local-1.4.5.tgz",
+      "integrity": "sha512-0/VdSv2YVXmcnwBb64XThMvjM1HnZJnPdv7CUgQbC5y/N9Wsr0Fu+j1oknE9fC/VPx9CpoSC6CJ0kza42skMSA==",
+      "dev": true,
+      "requires": {
+        "https-proxy-agent": "^4.0.0",
+        "is-running": "^2.1.0",
+        "ps-tree": "=1.2.0",
+        "temp-fs": "^0.9.9"
+      },
+      "dependencies": {
+        "agent-base": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
+          "integrity": "sha512-TMeqbNl2fMW0nMjTEPOwe3J/PRFP4vqeoNuQMG0HlMrtm5QxKqdvAkZ1pRBQ/ulIyDD5Yq0nJ7YbdD8ey0TO3g==",
+          "dev": true
+        },
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "https-proxy-agent": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-4.0.0.tgz",
+          "integrity": "sha512-zoDhWrkR3of1l9QAL8/scJZyLu8j/gBkcwcaQOZh7Gyh/+uJQzGVETdgT30akuwkpL8HTRfssqI3BZuV18teDg==",
+          "dev": true,
+          "requires": {
+            "agent-base": "5",
+            "debug": "4"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
+      }
+    },
     "btoa-lite": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/btoa-lite/-/btoa-lite-1.0.0.tgz",
@@ -1095,12 +1272,44 @@
       "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
       "dev": true
     },
+    "buffer-more-ints": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/buffer-more-ints/-/buffer-more-ints-1.0.0.tgz",
+      "integrity": "sha512-EMetuGFz5SLsT0QTnXzINh4Ksr+oo4i+UGTXEshiGCQWnsgSs7ZhJ8fzlwQ+OzEMs0MpDAMr1hxnblp5a4vcHg==",
+      "dev": true,
+      "optional": true
+    },
     "buffer-xor": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/buffer-xor/-/buffer-xor-1.0.3.tgz",
       "integrity": "sha1-JuYe0UIvtw3ULm42cp7VHYVf6Nk=",
       "dev": true
     },
+    "buildmail": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/buildmail/-/buildmail-4.0.1.tgz",
+      "integrity": "sha1-h393OLeHKYccmhBeO4N9K+EaenI=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "addressparser": "1.0.1",
+        "libbase64": "0.1.0",
+        "libmime": "3.0.0",
+        "libqp": "1.1.0",
+        "nodemailer-fetch": "1.6.0",
+        "nodemailer-shared": "1.1.0",
+        "punycode": "1.4.1"
+      },
+      "dependencies": {
+        "punycode": {
+          "version": "1.4.1",
+          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+          "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
     "builtin-modules": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
@@ -1114,9 +1323,9 @@
       "dev": true
     },
     "bytes": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
-      "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg=",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
+      "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==",
       "dev": true
     },
     "cacache": {
@@ -1364,6 +1573,24 @@
         "wrap-ansi": "^2.0.0"
       }
     },
+    "clone-deep": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/clone-deep/-/clone-deep-4.0.1.tgz",
+      "integrity": "sha512-neHB9xuzh/wk0dIHweyAXv2aPGZIVk3pLMe+/RNzINf17fe0OG96QroktYAUm7SM1PBnzTabaLboqqxDyMU+SQ==",
+      "dev": true,
+      "requires": {
+        "is-plain-object": "^2.0.4",
+        "kind-of": "^6.0.2",
+        "shallow-clone": "^3.0.0"
+      }
+    },
+    "co": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
+      "dev": true,
+      "optional": true
+    },
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
@@ -1490,14 +1717,14 @@
       }
     },
     "connect": {
-      "version": "3.6.6",
-      "resolved": "https://registry.npmjs.org/connect/-/connect-3.6.6.tgz",
-      "integrity": "sha1-Ce/2xVr3I24TcTWnJXSFi2eG9SQ=",
+      "version": "3.7.0",
+      "resolved": "https://registry.npmjs.org/connect/-/connect-3.7.0.tgz",
+      "integrity": "sha512-ZqRXc+tZukToSNmh5C2iWMSoV3X1YUcPbqEM4DkEG5tNQXrQUZCNVGGv3IuicnkMtPfGf3Xtp8WCXs295iQ1pQ==",
       "dev": true,
       "requires": {
         "debug": "2.6.9",
-        "finalhandler": "1.1.0",
-        "parseurl": "~1.3.2",
+        "finalhandler": "1.1.2",
+        "parseurl": "~1.3.3",
         "utils-merge": "1.0.1"
       }
     },
@@ -1602,9 +1829,9 @@
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     "union-value": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.0.tgz",
@@ -10137,11 +11437,16 @@
         }
       }
     },
-    "url-join": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/url-join/-/url-join-2.0.5.tgz",
-      "integrity": "sha1-WvIvGMBSoACkjXuCxenC4v7tpyg=",
-      "dev": true
+    "url-parse": {
+      "version": "1.4.7",
+      "resolved": "https://registry.npmjs.org/url-parse/-/url-parse-1.4.7.tgz",
+      "integrity": "sha512-d3uaVyzDB9tQoSXFvuSUNFibTd9zxd2bkVrDRvF5TmvWWQwqE4lgYJ5m+x1DbecWkw+LK4RNl2CU1hHuOKPVlg==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "querystringify": "^2.1.1",
+        "requires-port": "^1.0.0"
+      }
     },
     "url-template": {
       "version": "2.0.8",
@@ -10156,13 +11461,21 @@
       "dev": true
     },
     "useragent": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.3.0.tgz",
-      "integrity": "sha512-4AoH4pxuSvHCjqLO04sU6U/uE65BYza8l/KKBS0b0hnUPWi+cQ2BpeTEwejCSx9SPV5/U03nniDTrWx5NrmKdw==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/useragent/-/useragent-2.2.1.tgz",
+      "integrity": "sha1-z1k+9PLRdYdei7ZY6pLhik/QbY4=",
       "dev": true,
       "requires": {
-        "lru-cache": "4.1.x",
+        "lru-cache": "2.2.x",
         "tmp": "0.0.x"
+      },
+      "dependencies": {
+        "lru-cache": {
+          "version": "2.2.4",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-2.2.4.tgz",
+          "integrity": "sha1-bGWGGb7PFAMdDQtZSxYELOTcBj0=",
+          "dev": true
+        }
       }
     },
     "util": {
@@ -10192,6 +11505,13 @@
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
       "dev": true
     },
+    "uws": {
+      "version": "9.14.0",
+      "resolved": "https://registry.npmjs.org/uws/-/uws-9.14.0.tgz",
+      "integrity": "sha512-HNMztPP5A1sKuVFmdZ6BPVpBQd5bUjNC8EFMFiICK+oho/OQsAJy5hnIx4btMHiOk8j04f/DbIlqnEZ9d72dqg==",
+      "dev": true,
+      "optional": true
+    },
     "v8-compile-cache": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.0.2.tgz",
@@ -10334,30 +11654,34 @@
       }
     },
     "webpack-dev-middleware": {
-      "version": "2.0.6",
-      "resolved": "http://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-2.0.6.tgz",
-      "integrity": "sha512-tj5LLD9r4tDuRIDa5Mu9lnY2qBBehAITv6A9irqXhw/HQquZgTx3BCd57zYbU2gMDnncA49ufK2qVQSbaKJwOw==",
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/webpack-dev-middleware/-/webpack-dev-middleware-3.7.2.tgz",
+      "integrity": "sha512-1xC42LxbYoqLNAhV6YzTYacicgMZQTqRd27Sim9wn5hJrX3I5nxYy1SxSd4+gjUFsz1dQFj+yEe6zEVmSkeJjw==",
       "dev": true,
       "requires": {
-        "loud-rejection": "^1.6.0",
-        "memory-fs": "~0.4.1",
-        "mime": "^2.1.0",
-        "path-is-absolute": "^1.0.0",
-        "range-parser": "^1.0.3",
-        "url-join": "^2.0.2",
-        "webpack-log": "^1.0.1"
+        "memory-fs": "^0.4.1",
+        "mime": "^2.4.4",
+        "mkdirp": "^0.5.1",
+        "range-parser": "^1.2.1",
+        "webpack-log": "^2.0.0"
+      },
+      "dependencies": {
+        "mime": {
+          "version": "2.4.4",
+          "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
+          "integrity": "sha512-LRxmNwziLPT828z+4YkNzloCFC2YM4wrB99k+AV5ZbEyfGNWfG8SO1FUXLmLDBSo89NrJZ4DIWeLjy1CHGhMGA==",
+          "dev": true
+        }
       }
     },
     "webpack-log": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/webpack-log/-/webpack-log-1.2.0.tgz",
-      "integrity": "sha512-U9AnICnu50HXtiqiDxuli5gLB5PGBo7VvcHx36jRZHwK4vzOYLbImqT4lwWwoMHdQWwEKw736fCHEekokTEKHA==",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/webpack-log/-/webpack-log-2.0.0.tgz",
+      "integrity": "sha512-cX8G2vR/85UYG59FgkoMamwHUIkSSlV3bBMRsbxVXVUk2j6NleCKjQ/WE9eYg9WY4w25O9w8wKP4rzNZFmUcUg==",
       "dev": true,
       "requires": {
-        "chalk": "^2.1.0",
-        "log-symbols": "^2.1.0",
-        "loglevelnext": "^1.0.1",
-        "uuid": "^3.1.0"
+        "ansi-colors": "^3.0.0",
+        "uuid": "^3.3.2"
       }
     },
     "webpack-sources": {
@@ -10370,6 +11694,13 @@
         "source-map": "~0.6.1"
       }
     },
+    "when": {
+      "version": "3.7.8",
+      "resolved": "https://registry.npmjs.org/when/-/when-3.7.8.tgz",
+      "integrity": "sha1-xxMLan6gRpPoQs3J56Hyqjmjn4I=",
+      "dev": true,
+      "optional": true
+    },
     "which": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
@@ -10417,6 +11748,20 @@
         }
       }
     },
+    "with-callback": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/with-callback/-/with-callback-1.0.2.tgz",
+      "integrity": "sha1-oJYpuakgAo1yFAT7Q1vc/1yRvCE=",
+      "dev": true,
+      "optional": true
+    },
+    "word-wrap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.3.tgz",
+      "integrity": "sha512-Hz/mrNwitNRh/HUAtM/VT/5VH+ygD6DV7mYKZAtHOrbs8U7lvPS6xf7EJKMF0uW1KJCl0H701g3ZGus+muE5vQ==",
+      "dev": true,
+      "optional": true
+    },
     "wordwrap": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.3.tgz",
@@ -10508,6 +11853,13 @@
       "integrity": "sha1-wodrBhaKrcQOV9l+gRkayPQ5iz4=",
       "dev": true
     },
+    "xregexp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/xregexp/-/xregexp-2.0.0.tgz",
+      "integrity": "sha1-UqY+VsoLhKfzpfPWGHLxJq16WUM=",
+      "dev": true,
+      "optional": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
@@ -10524,7 +11876,8 @@
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
-      "dev": true
+      "dev": true,
+      "optional": true
     },
     "yargs": {
       "version": "12.0.5",
diff --git a/package.json b/package.json
index e6451dc..5380a66 100644
--- a/package.json
+++ b/package.json
@@ -22,16 +22,19 @@
     "just-once": "1.1.0"
   },
   "devDependencies": {
-    "karma": "^3.1.1",
-    "karma-chrome-launcher": "^2.2.0",
-    "karma-edge-launcher": "^0.4.2",
-    "karma-firefox-launcher": "^1.1.0",
-    "karma-jasmine": "^2.0.1",
-    "karma-junit-reporter": "^1.2.0",
-    "karma-safari-launcher": "^1.0.0",
-    "karma-sauce-launcher": "^1.2.0",
+    "karma": "2.0.5",
+    "karma-browserstack-launcher": "^1.5.1",
+    "karma-chrome-launcher": "3.1.0",
+    "karma-edge-launcher": "0.4.2",
+    "karma-fail-fast-reporter": "1.0.5",
+    "karma-firefox-launcher": "1.2.0",
+    "karma-ie-launcher": "1.0.0",
+    "karma-jasmine": "2.0.1",
+    "karma-junit-reporter": "1.2.0",
+    "karma-safari-launcher": "1.0.0",
+    "karma-sauce-launcher": "1.2.0",
     "karma-verbose-reporter": "0.0.6",
-    "karma-webpack": "^3.0.5",
+    "karma-webpack": "4.0.2",
     "prettier": "^1.15.3",
     "puppeteer": "^1.10.0",
     "semantic-release": "^15.13.1",
diff --git a/src/Mutex.js b/src/Mutex.js
index 9be7b7c..66e580e 100644
--- a/src/Mutex.js
+++ b/src/Mutex.js
@@ -7,37 +7,55 @@ module.exports = class Mutex {
     this._id = Math.random()
     this._database = name
     this._store = new idb.Store(this._database + "_lock", this._database + "_lock")
-    this._has = false
-    this._keepAliveTimeout = null
+    this._lock = null
   }
-  has () {
-    return this._has
+  async has () {
+    if (this._lock && this._lock.holder === this._id) {
+      const now = Date.now()
+      if (this._lock.expires > now) {
+        return true
+      } else {
+        return await this.renew()
+      }
+    } else {
+      return false
+    }
+  }
+  // Returns true if successful
+  async renew ({ ttl = 5000 } = {}) {
+    let success
+    await idb.update("lock", (current) => {
+      const now = Date.now()
+      const expires = now + ttl
+      success = current && current.holder === this._id
+      this._lock = success ? { holder: this._id, expires } : current
+      return this._lock
+    }, this._store)
+    return success
   }
   // Returns true if successful
-  async acquire ({ ttl = 5000, refreshPeriod } = {}) {
+  async acquire ({ ttl = 5000 } = {}) {
     let success
     let expired
     let doubleLock
     await idb.update("lock", (current) => {
       const now = Date.now()
+      const expires = now + ttl
       expired = current && current.expires < now
       success = current === undefined || expired
       doubleLock = current && current.holder === this._id
-      this._has = success || doubleLock
-      return success ? { holder: this._id, expires: now + ttl } : current
+      this._lock = success ? { holder: this._id, expires } : current
+      return this._lock
     }, this._store)
     if (doubleLock) {
       throw new Error('Mutex double-locked')
     }
-    if (success) {
-      this._keepAlive({ ttl, refreshPeriod })
-    }
     return success
   }
   // check at 10Hz, give up after 10 minutes
-  async wait ({ interval = 100, limit = 6000, ttl, refreshPeriod } = {}) {
+  async wait ({ interval = 100, limit = 6000, ttl } = {}) {
     while (limit--) {
-      if (await this.acquire({ ttl, refreshPeriod })) return true
+      if (await this.acquire({ ttl })) return true
       await sleep(interval)
     }
     throw new Error('Mutex timeout')
@@ -47,48 +65,18 @@ module.exports = class Mutex {
     let success
     let doubleFree
     let someoneElseHasIt
-    this._stopKeepAlive()
     await idb.update("lock", (current) => {
       success = force || (current && current.holder === this._id)
       doubleFree = current === void 0
       someoneElseHasIt = current && current.holder !== this._id
-      this._has = !success
-      return success ? void 0 : current
+      this._lock = success ? void 0 : current
+      return this._lock
     }, this._store)
-    if (!this._has) {
-      await idb.close(this._store)
-    }
+    await idb.close(this._store)
     if (!success && !force) {
       if (doubleFree) throw new Error('Mutex double-freed')
       if (someoneElseHasIt) throw new Error('Mutex lost ownership')
     }
     return success
   }
-  // Note: Chrome throttles & batches timers in background tabs to 1Hz,
-  // so there's not much point in having a refreshPeriod shorter than 1000.
-  // And TTL obviously needs to be greater than refreshPeriod.
-  async _keepAlive ({ ttl = 5000, refreshPeriod = 3000 } = {}) {
-    const keepAliveFn = async () => {
-      let success
-      let someoneDeletedIt
-      let someoneElseHasIt
-      await idb.update("lock", (current) => {
-        const now = Date.now()
-        someoneDeletedIt = current === void 0
-        someoneElseHasIt = current && current.holder !== this._id
-        success = !someoneDeletedIt && !someoneElseHasIt
-        this._has = success
-        return success ? { holder: this._id, expires: now + ttl } : current
-      }, this._store)
-      if (!success) this._stopKeepAlive()
-      if (someoneDeletedIt) throw new Error('Mutex was deleted')
-      if (someoneElseHasIt) throw new Error('Mutex lost ownership')
-    }
-    this._keepAliveTimeout = setInterval(keepAliveFn, refreshPeriod)
-  }
-  _stopKeepAlive () {
-    if (this._keepAliveTimeout) {
-      clearInterval(this._keepAliveTimeout)
-    }
-  }
 }
diff --git a/src/Mutex2.js b/src/Mutex2.js
new file mode 100644
index 0000000..e0e2234
--- /dev/null
+++ b/src/Mutex2.js
@@ -0,0 +1,49 @@
+module.exports = class Mutex {
+  constructor(name) {
+    this._id = Math.random()
+    this._database = name
+    this._has = false
+    this._release = null
+  }
+  async has () {
+    return this._has
+  }
+  // Returns true if successful
+  async acquire () {
+    return new Promise(resolve => {
+      navigator.locks.request(this._database + "_lock", {ifAvailable: true}, lock => {
+        this._has = !!lock
+        resolve(!!lock)
+        return new Promise(resolve => {
+          this._release = resolve
+        })
+      }); 
+    })
+  }
+  // Returns true if successful, gives up after 10 minutes
+  async wait ({ timeout = 600000 } = {}) {
+    return new Promise((resolve, reject) => {
+      const controller = new AbortController();
+      setTimeout(() => {
+        controller.abort();
+        reject(new Error('Mutex timeout'))
+      }, timeout);
+      navigator.locks.request(this._database + "_lock", {signal: controller.signal}, lock => {
+        this._has = !!lock
+        resolve(!!lock)
+        return new Promise(resolve => {
+          this._release = resolve
+        })
+      }); 
+    })
+  }
+  // Returns true if successful
+  async release ({ force = false } = {}) {
+    this._has = false
+    if (this._release) {
+      this._release()
+    } else if (force) {
+      navigator.locks.request(this._database + "_lock", {steal: true}, lock => true)
+    }
+  }
+}
diff --git a/src/PromisifiedFS.js b/src/PromisifiedFS.js
index 4014802..415deaa 100644
--- a/src/PromisifiedFS.js
+++ b/src/PromisifiedFS.js
@@ -3,10 +3,11 @@ const debounce = require("just-debounce-it");
 
 const Stat = require("./Stat.js");
 const CacheFS = require("./CacheFS.js");
-const { ENOENT, ENOTEMPTY } = require("./errors.js");
+const { ENOENT, ENOTEMPTY, ETIMEDOUT } = require("./errors.js");
 const IdbBackend = require("./IdbBackend.js");
 const HttpBackend = require("./HttpBackend.js")
 const Mutex = require("./Mutex.js");
+const Mutex2 = require("./Mutex2.js");
 
 const path = require("./path.js");
 const clock = require("./clock.js");
@@ -36,7 +37,7 @@ module.exports = class PromisifiedFS {
   constructor(name, { wipe, url, urlauto } = {}) {
     this._name = name
     this._idb = new IdbBackend(name);
-    this._mutex = new Mutex(name);
+    this._mutex = navigator.locks ? new Mutex2(name) : new Mutex(name);
     this._cache = new CacheFS(name);
     this._opts = { wipe, url };
     this._needsWipe = !!wipe;
@@ -101,9 +102,14 @@ module.exports = class PromisifiedFS {
       this._deactivationTimeout = null
     }
     if (this._deactivationPromise) await this._deactivationPromise
-    if (!this._activationPromise) this._activationPromise = this.__activate()
     this._deactivationPromise = null
-    return this._activationPromise
+    if (!this._activationPromise) this._activationPromise = this.__activate()
+    await this._activationPromise
+    if (await this._mutex.has()) {
+      return
+    } else {
+      throw new ETIMEDOUT()
+    }
   }
   async __activate() {
     if (this._cache.activated) return
@@ -113,7 +119,7 @@ module.exports = class PromisifiedFS {
       await this._idb.wipe()
       await this._mutex.release({ force: true })
     }
-    if (!this._mutex.has()) await this._mutex.wait()
+    if (!(await this._mutex.has())) await this._mutex.wait()
     // Attempt to load FS from IDB backend
     const root = await this._idb.loadSuperblock()
     if (root) {
@@ -135,9 +141,15 @@ module.exports = class PromisifiedFS {
     return this._deactivationPromise
   }
   async __deactivate() {
-    await this._saveSuperblock()
+    if (await this._mutex.has()) {
+      await this._saveSuperblock()
+    }
     this._cache.deactivate()
-    await this._mutex.release()
+    try {
+      await this._mutex.release()
+    } catch (e) {
+      console.log(e)
+    }
     await this._idb.close()
   }
   async _saveSuperblock() {
diff --git a/src/clock.js b/src/clock.js
index c7211f5..96fec1b 100755
--- a/src/clock.js
+++ b/src/clock.js
@@ -1,7 +1,12 @@
+const where = typeof window === 'undefined' ? 'worker' : 'main'
+
 module.exports = function clock(name) {
   performance.mark(`${name} start`);
+  console.log(`${where}: ${name}`)
+  console.time(`${where}: ${name}`)
   return function stopClock() {
     performance.mark(`${name} end`);
+    console.timeEnd(`${where}: ${name}`)
     performance.measure(`${name}`, `${name} start`, `${name} end`);
   };
 };
diff --git a/src/errors.js b/src/errors.js
index 8ea3626..24aa0fe 100755
--- a/src/errors.js
+++ b/src/errors.js
@@ -16,5 +16,6 @@ const EEXIST = Err("EEXIST");
 const ENOENT = Err("ENOENT");
 const ENOTDIR = Err("ENOTDIR");
 const ENOTEMPTY = Err("ENOTEMPTY");
+const ETIMEDOUT = Err("ETIMEDOUT");
 
-module.exports = { EEXIST, ENOENT, ENOTDIR, ENOTEMPTY };
+module.exports = { EEXIST, ENOENT, ENOTDIR, ENOTEMPTY, ETIMEDOUT };