What makes a browser good or bad ?!

[OldDarkstarAccount]

I think it would be interesting to see more opinions , if possible some arguments.
I think that the best browser is the one the fits your needs , but situations can change and in each case a certain browser may have advanges , I also think it depends on what exactly you use your browser for ... ( except opening web pages )

For example I use IE because it`s used by the majority of the users but I like Firefox because of it`s addons that can make easier the job of a designer.

[montyauto]

Have you try the newest IE7.0
Many advantage, some of FireFox features is adapted. The Tab Windows for example..