https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/versions/beta https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/v... Works, but very buggy

https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/versions/beta https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/v... Works, but very buggy with multiple sync sources, might be server-side, I've had trouble with failed syncs losing entire folders for a long time. I only use the Upload/Download functionality and make sure not to have conflicting syncs. The product has been on minimal life support for years, so can't expect much I guess. But remains the only solution I've seen that works cross-browser.