Going into the DOM Inspector and manually changing the form height to make the input usable in Mozilla (Blogger Pro defaults to a 13px tall textarea) loses its novelty very quickly. It’d be nice if there was a way to customize Mozilla your own custom per-site preferences in Mozilla. Just let me attach URI-based pre/post loading CSS of JavaScript and I’d be happy as a clam. If someone added an interface where people could start centralizing / swapping these customizations. Well, you’d really have something there. Just imagine the possibilities here. (No, not the cross-site scripting attacks, I’m talking about the good things, not the bad)… Hmm, the Mozilla Evangelism Sidebars do some neat things by enalbing css (user_pref("signed.applets.codebase_principal_support", true);) in the prefs.
Related tangent, people bitch about MS all the time, but they often forget that MS won huge amounts of popularity and mindshare because they were really developer friendly. Oftentimes I find myself wishing that Mozilla had documentation as complete as the DHTML Reference at MSDN.