Do you save/sync your bookmarks using the XMARKS extension (was Foxmarks)? This of course is to be safe, and then anytime I go to a different computer I just sync with XMARKS and then all my bookmarks are there.
So I am going to be using Comodo Dragon which - while not a big player - looks to be pretty secure as well. XMARKS synced all my bookmarks there just fine, and is a good app regardless of browser.
My choice - maybe different from yours - but you have to realize that the people who WERE Firefox 1.0, 1.5 whatever, are NOT these people anymore.
Just my 2-1/2 cents worth... :-)
Well, used to be that FF actually saved the bookmarks to a file called "bookmarks.html". These days, FF keeps track of bookmarks using JSON files. You can still export your JSON database to an HTMLfile. It will also either import an html file, or a json DB file. I believe they use mysql lite to manage this.
I like exporting it to the bookmarks.html file occasionally because I use the file as my "home" page. Makes for pretty quick startup. Because I've been as religious as I have been in keeping backups of my bookmarks, I still have the very first website that I ever went to buried in there somewhere. ;-) Since I had internet access before most folks had even heard of it, there are probably a significant number I could prune out that no longer work. Some that you wouldn't think so are still valid. I went to a gopher site sometime last year when looking for something. Not many of those are still being maintained.