Firefox Aurora 21.0a2 running on Windows 8 Pro x64. Extensions & Addons installed: Adblock Edge 2.0.3 App Button Remove 1.0 Cleanest Addon Manager 7.0 Greasemonkey 1.8 Greasemonkey script installed: Youtube Center 1.31.3 Problem: Whenever I watch Youtube videos there is a chance that the videos will be cut short for seemingly no reason. I originally thought that the fault was with the addon Tweak Network which I removed. After doing some testing I believed this to have solved the problem but alas, it still remains although not to the same degree as before. I've tried to disable each addon one after another and none seems to solve the problem. FWIW my internet has been acting dodgy as of late but I haven't really lost the connection or experienced anything wrong except 50% slower speed than usual.