Unfortunately www.revouninstaller.com tool didn't work for me... finally i have tried out a option in Mozilla browser itself to block savetube (www.landing.savetubevideo.com)

Once this page opens, right click > Page options click on 'Permission's tab & Block all, also go to securities tab & delete the cookies.

I have not faced problem afterward, I believe it is solved now..

i had this problem too. i seem to have found a fix.

first start firefox in safe mode. does that work? it worked for me. if that does work then start in normal mode, goto tools/addons/themes and go back to the default. then restart browser. fixed? with me i only had the default theme in the first place so that wasnt it. then tools/addons/extensions. disable everything. that fixed it for me. so from there once you know its one of the extensions then pick and choose which to enable and see who the culprit is, but if they're all disabled there shouldnt be an issue.

i should mention there's still a small problem. if i type something into the address bar, say "hello", it used to google that word. now instead it goes to a different search. but at least i can browse comfortably w/o that savetube site opening every few seconds. yayyy!