diff --git a/js/messaging.js b/js/messaging.js
index 00b84272..c27bef6a 100644
--- a/js/messaging.js
+++ b/js/messaging.js
@@ -17,6 +17,7 @@ if (!CHROME && !chrome.browserAction.openPopup) {
   FIREFOX = 50;
   browser.runtime.getBrowserInfo().then(info => {
     FIREFOX = parseFloat(info.version);
+    document.documentElement.classList.toggle('moz-appearance-bug', FIREFOX && FIREFOX < 54);
   });
 }
 
@@ -61,7 +62,7 @@ if (BG && !BG.getStyles && BG !== window) {
 }
 if (!BG || BG !== window) {
   document.documentElement.classList.toggle('firefox', FIREFOX);
-  document.documentElement.classList.toggle('moz-appearance-bug', FIREFOX && FIREFOX < 57);
+  document.documentElement.classList.toggle('moz-appearance-bug', FIREFOX && FIREFOX < 54);
   document.documentElement.classList.toggle('opera', OPERA);
   // TODO: remove once our manifest's minimum_chrome_version is 50+
   // Chrome 49 doesn't report own extension pages in webNavigation apparently