diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 0b942f3..c4cd395 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -24,7 +24,7 @@ jobs:
       BUNDLESIZE_GITHUB_TOKEN: $(BUNDLESIZE_GITHUB_TOKEN)
       SAUCE_ACCESS_KEY: $(SAUCE_ACCESS_KEY)
       SAUCE_USERNAME: $(SAUCE_USERNAME)
-      TEST_BROWSERS: 'ChromeHeadlessNoSandbox,FirefoxHeadless,sl_edge,sl_ios_safari,sl_android_chrome'
+      TEST_BROWSERS: 'ChromeHeadlessNoSandbox,FirefoxHeadless,sl_ios_safari,sl_android_chrome'
 
   - task: PublishTestResults@2
     displayName: 'Save test results'
diff --git a/src/PromisifiedFS.js b/src/PromisifiedFS.js
index ebc33bb..4014802 100644
--- a/src/PromisifiedFS.js
+++ b/src/PromisifiedFS.js
@@ -69,7 +69,7 @@ module.exports = class PromisifiedFS {
     // but there might not be any other fs operations needed until later. Therefore we
     // need to attempt to release the mutex
     this._activate().then(() => {
-      if (this._operations.size === 0) {
+      if (this._operations.size === 0 && !this._deactivationTimeout) {
         this._deactivationTimeout = setTimeout(this._deactivate.bind(this), 100)
       }
     })
@@ -89,6 +89,7 @@ module.exports = class PromisifiedFS {
         this._operations.delete(op)
         if (mutating) this.saveSuperblock() // this is debounced
         if (this._operations.size === 0) {
+          if (!this._deactivationTimeout) clearTimeout(this._deactivationTimeout)
           this._deactivationTimeout = setTimeout(this._deactivate.bind(this), 500)
         }
       }