This is probably an impossible thing to do with the current state of WebExt, but would it be possible to include an option to lock a tab (pinned or not) so as to prevent its url from changing as well as another to prevent accidentally closing said tab with a middle mouse click?
Thanks for your work on this extension btw, and for porting it to WebExt :v
EDIT : Concerning this :
First time the subject of “bookmark” has come up.
It should be fairly easy to add it but is there a popular demand for it?
How often people bookmark a whole lot of tabs together?
I often end up bookmarking a group of tabs when doing a search on the net, so I don’t lose the results, but I have to close all the other tabs or move them to another window before I can hit bookmark all open tabs. TBH that option would come in handy for me too.