It's a good thing I have a backup of my bookmarks from several months ago, since anything more recent than that has been wiped several times over. Mozilla 1.3 was fairly stable. It was a decent web browser, and I could go back to it if my subsequent adventures tire me. I upgraded to 1.4, but that was so unstable as to not bother with. I don't think I used it for more than a few days. Then came 1.5 and I was very, very happy. The feature I'd been coveting for ages had finally been incorporated into the browser: it queried a confirmation whenever I wanted to close multiple tabs! I was so happy that i didn't mind as much as I should have the first time the browser crashed and wiped out my bookmarks in the process.
Of course, then it kept doing it. It's not that it crashes very often, and that it crashes at all is partially a by-product of the software being both memory leaky and my tendency to leave browsers open for days, if not weeks, on end, if I can. But every time 1.5 has crashed, it's wiped out what few new bookmarks I'd added in. At least, whenever I find stability again, I can upload that August backup.
Today, I'm trying out Firebird 0.7.1. I don't know what known bugs there are for it. It doesn't use my Mozilla preferences, so I'm having to figure out what many of my passwords are. But at least it shouldn't wipe out my bookmarks.