Why can't I paste into youtube comments on firefox

NOTE: The following "fix" has been known to cause problems on some sites. Please see this answer for a better solution.

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Answered on Tomshardware by pcdude234:

I have a fix. go to your address bar and type "about:config" no quotes, and then hit the "i'll be careful, I promise" button, next type "dom.event.clipboardevents.enabled" then double click it, so the value is false. And that should do the trick.

Worked :P

This is a pretty old question now, but I re-installed windows a while back and when I ran into this problem again, I decided to find a better fix.

Don't touch about:config. This way, any other functionality dom.event.clipboardevents provides doesn't break.

Instead, install this userscript by Sergey Rozhenko. (Userscripts can be installed with the help of an addon such as Greasemonkey or Violentmonkey.)

// ==UserScript==
// @id             Fix paste on YouTube
// @name           Fix paste on YouTube
// @version        1.0
// @namespace      GrayFace
// @author         Sergey "GrayFace" Rozhenko
// @description    Fixes paste function in comments on YouTube
// @include        https://www.youtube.com/*
// @include        http://www.youtube.com/*
// ==/UserScript==

function handler(e){
    e.stopPropagation();
}

addEventListener('paste', handler, true);