I used to really enjoy Firefox Mozilla version ( 20.0.1 ) fast reliable etc etc .. but for the past few weeks- problems problems problems ..
It seemed five times slower loading up ..than Google Chrome .. It seemed to be always full of 'spam type' quality's ... ( always extra tabs on the top row that had to be closed off after a few days )

also would lock up my other users (3) on the PC windows Xp ........... all reported same symptoms ..

So I pulled the plug for this default browser and am back to Google Chrome again .. Fast reliable and for the time being my main browser ..

will keep Firefox Mozilla in my favourites in case Chrome starts to act up one day ..