Firefox 3.6.3 portable is the best internet browser. Versions prior R less flexible, & versions post R buggy. The key is 2 have several windows open. One is always 3.6.3 portable from portableapps.com. The other is whatever the latest bugfest Mozilla has krapped out, only & I mean ONLY because some pages will not display properly in 3.6.3. 4 example, youtube comments, or some video sites content won't show @ all. Other than that, everything about all other versions of Firefox is WORSE than 3.6.3, ESPECIALLY if the videos U want will play in 3.6.3, bacause 4 Youtube 4 instance it is INFINITELY faster & more stable, & doesn't give U the endless 'please upgrade Flash' nonsense. 1 other thing later versions R good 4 is some 'Java Hell' sites like Pinterest & TUmblr, because 3.6.3 will drag on those. Of course, can always disable java script using 'quickjava' addon buttons, & 'noscript' & such, but if U want 2 actually USE java, the later versions R faster. Other than that, it's all krap after 3.6.3. Seriously, I try EVERY version that comes out, & they just get even more ridiculous. Like all the hoops U have 2 go through just 2 get the fuking tabs down back below the address bar where they belong ~ GIVE ME A BREAK! & yes, I got LOTS of addons installed on BOTH versions. The 1 & ONLY 1 thing that is really kool about new versions is there is an addon called 'onetab' that won't work on 3.6.3. Oh well! Few other things here & there, but basically everything after 3.6.3 I just use if something won't work right in 3.6.3. This is the rare exception. So people, if U R having trouble, don't waste your life trying 2 'troubleshoot' Mozilla's turds. Just get yourself Firefox Portable 3.6.3 from Portableapps.com & ENJOY! =D Imagine all the fun things U can do when U R not throwing your time down the toilet trying 2 polish their latest turd LOL