[Enhancement Request] Add Support for Firefox Sync

[lukasubo]

Thanks for making a great extension! Very useful for managing large amounts of open tabs in conjunction with Auto Tab Discard. The only feature I miss is syncing the settings using Firefox Sync. According to the FF Sync website, this requires adding a few preferences. Would it be possible to add this as a feature?

https://wiki.mozilla.org/Services/Sync/Addon_Sync#Are_Add-on_Settings_Synchronized.3F
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/sync

[Lej77]

I'll take a look at this, hopefully it isn't too hard!