So you found a way to break Firefox. Big wow. It will probably be patched next release. Certainly doesn't mean it's not "safe". Besides, what are the chances of being caught in a MITM attack in the real world? Maybe on an unsecured wireless network... not enough to keep me from using FF.
Firefox is not standards-compliant
That is annoying. Opera has the same problem. But I remember when IE was the browser with major standards-compliancy issues! Hopefully this will be addressed in upcoming FF releases.
Not true, although I'll allow there are a few things you have to tweak (
http://tatumweb.com/blog/2007/01/05/making-firefox-faster/). Around v2.0 FF started to get a little "clunky" out of the box. But I just installed FF on an old 266MHz box, and after tweaking it, it runs beautifully - it does take a little longer to initialize than IE6 (but I suspect IE8 would take longer too, that is, if it supported Win2K...

)
You make some valid points about some of Firefox's shortcomings. However, I was really put-off by your post-title "Why You Shouldn't Use Firefox" - maybe something like "Why I don't like Firefox" would have sat better with me

.
At any rate, I use all sorts of different browsers. But it seems like I always come back to Firefox as my default - on both Windows and Linux. And with the new Personas add-on, I am hooked! I'm sure it will be mimicked by other browsers soon, but afaik it's the only browser that has that level customization right now. I am a "Firefox Fanboi". It's good enough for me. I'm not "anti-Microsoft," but after so many
traumatizing experiences with past versions of IE, I find it very hard to back to using it (for anything except Microsoft Updates). However, I will say that it looks like MS has finally released a stable quality browser. But I'll keep my distance.
