diff --git a/webextensions/api/tabs.json b/webextensions/api/tabs.json
index db690eccf7626..c9200a39d7279 100644
--- a/webextensions/api/tabs.json
+++ b/webextensions/api/tabs.json
@@ -1243,6 +1243,82 @@
               },
               "safari_ios": "mirror"
             }
+          },
+          "defaultZoomFactor": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": true
+                },
+                "edge": {
+                  "version_added": "79"
+                },
+                "firefox": [
+                  {
+                    "version_added": "107"
+                  },
+                  {
+                    "version_added": "45",
+                    "partial_implementation": true,
+                    "notes": "Returns 1, regardless of the default zoom factor setting."
+                  }
+                ],
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "mode": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": true
+                },
+                "edge": {
+                  "version_added": "79"
+                },
+                "firefox": {
+                  "version_added": "45"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
+          },
+          "scope": {
+            "__compat": {
+              "support": {
+                "chrome": {
+                  "version_added": true
+                },
+                "edge": {
+                  "version_added": "79"
+                },
+                "firefox": {
+                  "version_added": "45"
+                },
+                "firefox_android": {
+                  "version_added": false
+                },
+                "opera": "mirror",
+                "safari": {
+                  "version_added": false
+                },
+                "safari_ios": "mirror"
+              }
+            }
           }
         },
         "ZoomSettingsMode": {