Hmm, my browser isn't even mentioned: Mozilla. (the old, classical, fullblown, Netscape-inherited browser suite, not the Firefox derivate). I use Firefox (1.x) occasionally, but usually Mozilla is it.
The reason is partly habit: i was "raised" with Netscape when what i knew as Internet started to transform to the world-wide-wait we all come to love. A more tangible reason is: i like Mozillas capability to type text into the address line, press <cursor down> and <ENTER> and it will do a search on these words with my favourite search engine. I also like the "window-oriented" modus operandi of Mozilla better than Firefoxes "tabs-oriented" way. This is just personal taste: i like several windows better than several tabs.
On top of that i use the other parts of the Mozilla browser suite (Mozilla Mail and Address Book - i detest IRC chatting and i write my HTML code in vi) on a common basis, so there is no waste in installing a complete suite instead of a standalone browser.
I dislike the memory leakage as everybody and am acquainted with (but still hate) having to restart the browser every few weeks anew.
For IE i have no purpose at all, not even when i have to work on Windows -
see here.
bakunin