diff --git a/src/main.coffee b/src/main.coffee
index e2bc37171..b59e18916 100644
--- a/src/main.coffee
+++ b/src/main.coffee
@@ -468,8 +468,6 @@ Main =
 
     if $.hasClass d.body, 'fourchan_x'
       alert '4chan X v2 detected: Disable it or v3 will break.'
-    if /Firefox\/1/.test navigator.userAgent
-      alert 'Your version of Firefox is incompatible with 4chan X v3. Firefox 20+ is required.'
 
     $.event '4chanXInitFinished'
     Main.checkUpdate()