Can definitely be due to addons. That innocuous Emoji keyboard addon [1] for example, caused horrible page load performance and unresponsiveness (due apparently

Can definitely be due to addons. That innocuous Emoji keyboard addon [1] for example, caused horrible page load performance and unresponsiveness (due apparently to parsing the entire DOM in order to replace/insert emojis); filed a bug at [2]. Hope the move to WebExtensions lets Mozilla provide less opportunities for extension developers to shoot users in the foot. [1] https://addons.mozilla.org/en-US/firefox/addon/emoji-keyboard-by-emojione/ https://addons.mozilla.org/en-US/firefox/addon/emoji-keyboar... [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1339822 https://bugzilla.mozilla.org/show_bug.cgi?id=1339822