I'm coming back to FF from Vivaldi and i was looking for a sidebar mostly for Tab and Bookmark managing.

This addon looks pretty good, but whenever i enable "Tabs" on the "Services" options, everytime i run FF (or disable/re-enable the addon), a new tab opens by itself.

I looked all over but couldn't find an option to disable this behavior and it's pretty annoying. Is it a bug? Is it intended? No idea, if i find a way to fix it i'll change my rating.