I am one of the worst offenders of the "keep the tabs open variety". I have several hundreds of them open for months on end. For this rather unusual browsing habit, no other browser other than FF works for me. FF does fine even on my 512MB Pentium-M laptop, Chrome for instance will make such a box unusable . Am somewhat relieved/piqued to see that this behavior is not unique. I have been asked to defend my habit many…
My solution for tab syncing was creating symbolic links to my Dropbox to keep my Firefox user directory in sync across computers, and that comes with the added benefit of everything syncing, plugins, addons, customizations, settings etc. which accumulated in my computer through the years of Firefox use, which I can call at this point an UI fork of mainline Firefox. As long as you don’t open the same Firefox in two places, this solution works pretty well. A recounting of how I did it is available at my blog at this link: http://sublunarorb.it/post/34087338428/so-you-need-to-actual... but it’s aimed at casual users, so it’s a little bit chatty.