How To Boost Youtube Performance in Mozilla Firefox 

Follow the given below steps for doing this ...

1. First you open your firefox browser and in the adress bar type "about:config" And hit enter.

2. When you will hit enter then you will get a warning message , Just you ignore it  and click

on I'll be careful, I promise.

3. Then in the filter text entry bar, type "browser.sessionstore.interval" 

   Just Double click on it and change its value to 120000.