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... :-)