here are a number of sites I frequent that don't display properly with it, and also I *despise* the fact that whenever I click on a picture link (ala attached photos in TRF posts), it makes me open Photoshop rather than just pop it up in a new browser window.
Was going to say the same thing as gothique, but he beat me too it
Plus, having firefox doesn't mean you have to abandon IE...I use firefox when visiting sites I'm unsure of, and for most general browsing, but go back to IE for sites that require special plugins in order to work that I know are safe (banking sites, anything involving Sony). Firefox is still considered beta, and even some very basic html tags are not handled correctly; an example would be the < pre /pre > tags...an early html tag used to format spaces in html and the like...firefox does not handle them correctly . Firefox also seems to have problems with web-sites that use DHTML as well; however, more common scripting languages such java script, PHP annd Perl are handled fine. I am unsure how well Firefox handles XML.
As for spotting spyware and trojans that are "unknown" (ie: spybot doesn't do a search for them, or in the case of trojans/viruses, Nortan and Macafee do not have a definition for them yet),
here is what I : Working in the computer field, I already know what many of the processes and services running under xp and the various Window's server family's do. Those remaining services and processes for which I do not know the function of, but which are always present as soon as the OS is installed, I have basically memorize.
I have also memorized what items are in the registry under */software/microsoft/windows/currentversion/run and HKCU/software/microsoft/windows/currentversion/internet settings. Whenever I install new software, I note any new entries made in these areas, if any, and what processes are launched.
Then I check the registry on a weekly basis with msconfig, and on a daily basis I look to see what processes are running. If I see something new suddenly show up, without me having deliberately installed anything new, then I know my system has been compromised.
In addition to these manual checks, I have the following security software running: Nortan, Spy Bot S&D version 1.3 (the new version that tries to block software from changing the registry), Zone Alarm, Kerio PFW (yeah I keep 2 firewalls), Etherial (a sniffer), and GFI Languard. I have all of these tools, because I work at a Computer Tech school, full of students who are constantly hacking and writing brand new trojan scripts that no commercial software is going to have any definition for.