It's more likely he's just trolling than astroturfing. As for posting as AC, I do that all the time, it's usually because I'm too lazy to log in.
Firefox, I can't agree with you. Not in the slightest. It crashes all the time on every platform I've run it on (Windows, Linux x86, Linux PPC, FreeBSD) and has some real annoyances like still using far too much memory (which causes horrible problems if you want to do something like LTSP).
Right now I've come to prefer things like Arora (simplicity at its best) and I'm toying with the developer channel version of Chrome.. which also has it's bugs but they're getting fixed faster than Firefox's release strategy, and I'm getting my work done faster even in a beta browser.
Am I most users? No. I actually watched the development of Mozilla for a number of years for the sheer morbidity of it, while they were completely rewriting their entire codebase (I was working on a browser project at the time, and we just completely rewrote ours too) and I must say the development process, the code, is just frightful. The closest thing to a decent web browser right now is Safari. If only they'd get rid of that godawful brushed metal dark-on-dark monstrosity of a UI on Windows I might actually use it..
OpenOffice, I like, but it's really falling down because for an office package that supposedly usurps the Microsoft monopoly on Office software, it's not any smaller once it's installed (so, still bloat..) and half the features I'm used to in Office are missing. It's not really an alternative; and it suffers the same memory usage flaws of Firefox (something I can't imagine Microsoft Word managing to do, which is make my system start swapping like a lunatic). The development process is ridiculously slow and yet again the code and the people running it are frightful..
So basically neither project does it any better than the alternative, which right now seems to be IE8 RC1 (which I find pleasing to use if jarring moving from browser to browser and losing 10% of my screen real estate to that awful toolbar) and Microsoft Office 2007, which you can now run in a web browser too, if you can find one that doesn't suck :)