So if WebExtension were to have the necessary API, you would do one?

[DumbJoe]

TTHIS ADDON IS IMPOSSIBLE TO CONVERT INTO WEBEXTENSION, DUE TO LACK OF NEEDED API, THEREFOR IT WILL NEVER BE POSSIBLE ADAPT FOR FIREFOX QUANTUM (V57 AND NEWER)

Was almost about to try out my hand at creating an equivalent one but one that works on Quantum browser until I read that and gave up...lol....

So if you were to create a new one using WebExtensions, which of the following features would be unavailable?

• Ability change how many session history items fit in the menu (default: 15)
  - If history list has more items then fit in the menu, show scroll bars or scroll buttons
  - Show item position in the list as well as total items number
  - Show items as title or url
  - Show on hover items as title or url
  - Select what to show in tooltip: title, url or both
  - Copy address in clipboard from within the history popup

..or all of them?

Also extensions.legacy.enabled does not work in Firefox version 60.4 ESR.....all it does is remove the extra legacy tab and puts all legacy addons in the same area as compatible ones....

Also your addon page has been deleted.......had to google your addon to find this github page....lol