Firefox it's fast secure and almost all sites display perfectly.
Was using Firefox (mainly for the web developer extensions) but have recently switched to Chromium, which is much faster, or feels that way at least.
Use IE8 for 443 stuff.
I use Firefox in lockdown mode, where I only allow cookies that I want. Use IE8 for 443 stuff.
Firefox, although I've been trying to get Safari to work to replace it.
Started playing with Chromium myself and i certainly feels snappy and responsive, however - the lack of ad-block support is a bit sucky, as is the fact that it uses a huuuge amount of ram (the latter is just a bit sucky though, as I have 4 GB).
Haven't noticed this with my version (4.0.222.5 (Ubuntu build 28701)). My total memory usage at the moment with several apps open is about 240MB. One of the perils of running from the development version perhaps?