The idea is good, especially now that Xmarks (my favorite bookmark syncing add-on) has many problems with Firefox (both Quantum and non-Quantum)... Unfortunately this add-on won't allow me to login with neither Google or Facebook, nor sign up with any other email address... Guys don't be surprised if you get no new users!
I look forward to a fix to this issue in a short time...
Thank you for the review. This issue occurs when you are not logged in with Google or Facebook and try and log in. It should work if you log into Google or Facebook in another tab. It will also work if you are logged into Bookmark OS. We are currently looking into a fix.
