diff --git a/css/selectors/read-only.json b/css/selectors/read-only.json
index dbbb9c34f401d9..c482a266897d71 100644
--- a/css/selectors/read-only.json
+++ b/css/selectors/read-only.json
@@ -26,10 +26,7 @@
                 "version_added": "1.5"
               }
             ],
-            "firefox_android": {
-              "prefix": "-moz-",
-              "version_added": "4"
-            },
+            "firefox_android": "mirror",
             "ie": {
               "version_added": false
             },
diff --git a/css/selectors/read-write.json b/css/selectors/read-write.json
index 8bf280980f88e0..75f8d7bfdf689b 100644
--- a/css/selectors/read-write.json
+++ b/css/selectors/read-write.json
@@ -26,10 +26,7 @@
                 "version_added": "1.5"
               }
             ],
-            "firefox_android": {
-              "prefix": "-moz-",
-              "version_added": "4"
-            },
+            "firefox_android": "mirror",
             "ie": {
               "version_added": false
             },