diff --git a/firefox.js b/firefox.js
index dc9838f..8978db1 100644
--- a/firefox.js
+++ b/firefox.js
@@ -56,6 +56,7 @@ user_pref("media.ffmpeg.vaapi.enabled", true);
 user_pref("media.ffvpx.enabled", false);
 
 // Lazy loading is too late on Firefox. See https://bugzilla.mozilla.org/show_bug.cgi?id=1618240
+// Should be fixed in Firefox 84.
 user_pref("dom.image-lazy-loading.enabled", false);
 
 // Disable DoH for now