[teddyfrozevelt]

What would you lose? You can just import the bookmarks and find alternate addons.

If you have passwords Xmarks isn't a webextension but you can use it on Firefox 56 and then upgrade.

[anotherevan]

FYI, it looks like they are working on a webextension version of Xmarks.

https://forums.lastpass.com/viewtopic.php?f=45&t=266745&star...

This was a big relief for me, as it was the one extension I was really sweating on.

That said, I would love if there was a Chrome sync for Firefox, or Firefox sync for Chrome capability to sync bookmarks across them both.