Best (favorite) browser :D

Firefox 4!! its fast safe and reliable. (just delete cache and cookies often)

IE6!! its fast safe and reliable. (just delete cache and cookies often and never load it into memory)

Nothing can beat Firefox 4,its fast safe and reliable.Nearest competitor Google chrome for sure.
Whats Great in Firefox
1)Beautiful Themes support.
2)Maximum speed(I use dial-up and using latest chrome,firefox,opera,chrome's speed almost same but have no app like "AD-Block Plus" which blocks ADs I don't want to see and load the page faster,it is supported by Firefox.IE-worst browser I have ever used)
3)It is Best up to bottom

firefox.....

ie6 is outdated and has many security flaws!

Sorry you must have mistaken me as a complete idiot rather than a witty nerd playing on the fact that any browser is safe and reliable if it isn't run.  

I'll always prefer Firefox but as mentioned above Google chrome is number 2, Google Chrome did become my preferred browser at one point but I've come across many issues with regards to JavaScript working correctly.

So, Firefox all the way! Some marvelous extensions (especially the web developer one).