diff --git a/webextensions/api/windows.json b/webextensions/api/windows.json
index 802bd75fde9e3a..1ac1ce16d2d3a5 100644
--- a/webextensions/api/windows.json
+++ b/webextensions/api/windows.json
@@ -479,11 +479,9 @@
             "__compat": {
               "support": {
                 "chrome": {
-                  "version_added": true
-                },
-                "edge": {
-                  "version_added": "79"
+                  "version_added": "≤59"
                 },
+                "edge": "mirror",
                 "firefox": {
                   "version_added": false
                 },
@@ -500,11 +498,9 @@
             "__compat": {
               "support": {
                 "chrome": {
-                  "version_added": true
-                },
-                "edge": {
-                  "version_added": "79"
+                  "version_added": "≤59"
                 },
+                "edge": "mirror",
                 "firefox": {
                   "version_added": "45"
                 },
@@ -525,11 +521,9 @@
             "__compat": {
               "support": {
                 "chrome": {
-                  "version_added": true
-                },
-                "edge": {
-                  "version_added": "79"
+                  "version_added": "≤59"
                 },
+                "edge": "mirror",
                 "firefox": {
                   "version_added": "45"
                 },
@@ -550,11 +544,9 @@
             "__compat": {
               "support": {
                 "chrome": {
-                  "version_added": true
-                },
-                "edge": {
-                  "version_added": "79"
+                  "version_added": "≤59"
                 },
+                "edge": "mirror",
                 "firefox": {
                   "version_added": "45"
                 },