What does your feature entail? What is it for? How will it affect existing workflows or user experience?
I noticed that right clicking the + button in the toolbar shows 'Recently Closed Tabs'.
Might be nice to mirror this behaviour in the sidebars new tab button too.
What are the exact ways that you see a user using your proposed feature? Please go into as much detail as possible, and provide examples of how other browsers/apps implement this feature, if applicable. If your feature suggestion adds on to an existing feature, how would it work into it to extend its usefulness?
Right clicking the sidebar + (new tab) button shows 'Recently Closed Tabs' too.
It would be useful because you could remove the '+' button in the toolbar if you want to access tab history.