diff --git a/4chan_x.user.js b/4chan_x.user.js
index a66065191..7cb5be1fa 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -3022,6 +3022,7 @@
         opacity: .5;\
       }\
 \
+      /* Firefox bug: hidden tables are not hidden */\
       [hidden] {\
         display: none;\
       }\
diff --git a/script.coffee b/script.coffee
index b038352fd..317ac69a9 100644
--- a/script.coffee
+++ b/script.coffee
@@ -2412,6 +2412,7 @@ main =
         opacity: .5;
       }
 
+      /* Firefox bug: hidden tables are not hidden */
       [hidden] {
         display: none;
       }