diff --git a/api/StorageManager.json b/api/StorageManager.json
index 354b81e7309101..444eaf735da6dd 100644
--- a/api/StorageManager.json
+++ b/api/StorageManager.json
@@ -4,14 +4,11 @@
       "__compat": {
         "mdn_url": "https://developer.mozilla.org/docs/Web/API/StorageManager",
         "support": {
-          "webview_android": {
-            "version_added": null
-          },
           "chrome": {
-            "version_added": null
+            "version_added": "48"
           },
           "chrome_android": {
-            "version_added": null
+            "version_added": "48"
           },
           "edge": {
             "version_added": null
@@ -19,20 +16,42 @@
           "edge_mobile": {
             "version_added": null
           },
-          "firefox": {
-            "version_added": null
-          },
+          "firefox": [
+            {
+              "version_added": "57"
+            },
+            {
+              "version_added": "51",
+              "version_removed": "57",
+              "notes": "See <a href='https://bugzil.la/1304966'>bug 1304966</a> and <a href='https://bugzil.la/1399038'>bug 1399038</a>.",
+              "flags": [
+                {
+                  "type": "preference",
+                  "name": "dom.storageManager.enabled",
+                  "value_to_set": "true"
+                }
+              ]
+            }
+          ],
           "firefox_android": {
-            "version_added": null
+            "version_added": "51",
+            "notes": "See <a href='https://bugzil.la/1304966'>bug 1304966</a> and <a href='https://bugzil.la/1399038'>bug 1399038</a>.",
+            "flags": [
+              {
+                "type": "preference",
+                "name": "dom.storageManager.enabled",
+                "value_to_set": "true"
+              }
+            ]
           },
           "ie": {
             "version_added": null
           },
           "opera": {
-            "version_added": null
+            "version_added": true
           },
           "opera_android": {
-            "version_added": null
+            "version_added": true
           },
           "safari": {
             "version_added": null
@@ -42,6 +61,9 @@
           },
           "samsunginternet_android": {
             "version_added": null
+          },
+          "webview_android": {
+            "version_added": "48"
           }
         },
         "status": {
@@ -54,14 +76,11 @@
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/StorageManager/estimate",
           "support": {
-            "webview_android": {
-              "version_added": null
-            },
             "chrome": {
-              "version_added": null
+              "version_added": "52"
             },
             "chrome_android": {
-              "version_added": null
+              "version_added": "52"
             },
             "edge": {
               "version_added": null
@@ -70,19 +89,19 @@
               "version_added": null
             },
             "firefox": {
-              "version_added": null
+              "version_added": "51"
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": "51"
             },
             "ie": {
               "version_added": null
             },
             "opera": {
-              "version_added": null
+              "version_added": true
             },
             "opera_android": {
-              "version_added": null
+              "version_added": true
             },
             "safari": {
               "version_added": null
@@ -92,6 +111,9 @@
             },
             "samsunginternet_android": {
               "version_added": null
+            },
+            "webview_android": {
+              "version_added": "52"
             }
           },
           "status": {
@@ -105,15 +127,26 @@
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/StorageManager/persist",
           "support": {
-            "webview_android": {
-              "version_added": null
-            },
-            "chrome": {
-              "version_added": null
-            },
-            "chrome_android": {
-              "version_added": null
-            },
+            "chrome": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "requestPersistend",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ],
+            "chrome_android": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "requestPersistend",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ],
             "edge": {
               "version_added": null
             },
@@ -121,19 +154,19 @@
               "version_added": null
             },
             "firefox": {
-              "version_added": null
+              "version_added": "55"
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": "55"
             },
             "ie": {
               "version_added": null
             },
             "opera": {
-              "version_added": null
+              "version_added": true
             },
             "opera_android": {
-              "version_added": null
+              "version_added": true
             },
             "safari": {
               "version_added": null
@@ -143,7 +176,17 @@
             },
             "samsunginternet_android": {
               "version_added": null
-            }
+            },
+            "webview_android": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "requestPersistend",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ]
           },
           "status": {
             "experimental": false,
@@ -156,15 +199,26 @@
         "__compat": {
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/StorageManager/persisted",
           "support": {
-            "webview_android": {
-              "version_added": null
-            },
-            "chrome": {
-              "version_added": null
-            },
-            "chrome_android": {
-              "version_added": null
-            },
+            "chrome": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "persistentPermission",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ],
+            "chrome_android": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "requestPersistend",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ],
             "edge": {
               "version_added": null
             },
@@ -172,19 +226,19 @@
               "version_added": null
             },
             "firefox": {
-              "version_added": null
+              "version_added": "55"
             },
             "firefox_android": {
-              "version_added": null
+              "version_added": "55"
             },
             "ie": {
               "version_added": null
             },
             "opera": {
-              "version_added": null
+              "version_added": true
             },
             "opera_android": {
-              "version_added": null
+              "version_added": true
             },
             "safari": {
               "version_added": null
@@ -194,7 +248,17 @@
             },
             "samsunginternet_android": {
               "version_added": null
-            }
+            },
+            "webview_android": [
+              {
+                "version_added": "52"
+              },
+              {
+                "alternative_name": "persistentPermission",
+                "version_added": "48",
+                "version_removed": "52"
+              }
+            ]
           },
           "status": {
             "experimental": false,