firefox running not smooth on Youtube

HI

its not only Firefox , its ALL same like browser in any version (x32 or x64) include palemoon and waterfox.
the issue happen when u play a clip in youtube and try moving the mouse (up down left right fast) in any direction over and a side the running clip.
i disabled "hardware acceleration" in palemoon option and it fix the problem a little bit. (my system is win 7 x64 )
this matter is not only me , its been reported by some users in other forum.

recently i found a way threw , some sort of a cure to solve this matter , and it was installing "greasemonkey" and a special script who claim to block / remove youtube ads.

I was surprised to see that this script FIX the matter big time !!!


i need youhelp to dig this script up and search what it disabled in youtube page which coz all of this.

just to mention in google chrome all run smooth and this issue doesn't exist

first greasemonkey plugin can be locate here

https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/?src=search

youtube script i found can be locate here

http://userscripts.org/scripts/show/74961

the all script source code look like this

// ==UserScript==
// @name remove Youtube adds
// @namespace youtubetads
// @version 1.1
// @author FDisk
// @description Remove youtube ads from the right side of the screen and from the embeded video
// @include http://*.youtube.com/watch?*
// @include http://youtube.com/watch?*
// @require http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js
// @require http://jquery.lukelutman.com/plugins/flash/jquery.flash.js
// @require http://usocheckup.redirectme.net/74961.js
// ==/UserScript==

//Check for updates

$('#homepage-sidebar-ads').remove();

$('#google_companion_ad_div, #watch-channel-brand-div, #watch-channel-brand-div').remove();
var video = 'https://www.youtube-nocookie.com/v/'+$('#watch-mfu-button').attr('data-video-id');
$('#watch-player').empty().flash(
{
height: 1280,
width: 720,
src : video+'?version=1&autoplay=0&fs=1&hd=1'
}
);

 

am guessing adblock plus default settings also cures this?

 

Unfortunately , only the way i found outץ

 

strange, i dont have that issue with 4 firefox installs on different hardware, but i am using adblock plus on all of them. have you tried disabling hardware acceleration on adobe flash's menu instead of the browser? you have solved your issue so i suppose there is no need to find out, just throwing this out there for anyone experiencing the same issue and who does not want to use the solution specified by demoneye

 

there is a better way i just be informed by dood called megaman (10x pal).

u can download this plugin which replace flash.

https://addons.mozilla.org/en-US/firefox/addon/flashvideoreplacer/?src=ss


cheers

 

The only cons is that you can't fullscreen with the youtube script

 

right , u cant ...but maybe u can try the other way i mention with the FlashVideoReplacer , maybe that suit u more