How is Xmarks holding for you? I couldn't get it to work satisfactorily, so I created my own solution for syncing my tabs across computers. Didn't use it for bookmarks, as I use Pinboard.in for that. Just like you I use my tabs as temporary bookmarks, and "proper" bookmarks as permanent ones—there are lots of solutions to handle permanent bookmarks, but not for tabs whatsoever.
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.
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How is Xmarks holding for you? I couldn't get it to work satisfactorily, so I created my own solution for syncing my tabs across computers. Didn't use it for bookmarks, as I use Pinboard.in for that. Just like you I use my tabs as temporary bookmarks, and "proper" bookmarks as permanent ones—there are lots of solutions to handle permanent bookmarks, but not for tabs whatsoever.
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.