This is exactly what I want!

Request: I want a switch to temporarily disable this from toolbar.

I seriously can't believe this isn't part of those other tab management plugins.

Does exactly what it says on the tin. Quite essential if you've got loads of tabs open and tend to open the same stuff...

works great!!. Additionally one thing i want is that it should detect duplicate tabs in same container but different windows. When scope is selected as "container" i am able to open duplicate tabs for a particular container across different firefox windows.
i can select scope as "all windows" but then I will not be able to open duplicate tabs in different containers.

Update: Thanks for implementing this

It has all of the options I need like keeping the newer tab open or eliminating the search part from the url. Thank you!

Works perfectly and very useful. Nicely set up, with important options easily accessed. Thank you dev!

1 question - can you have the Container and All windows options both selected? If so, a tick next to container option would be helpful.

A feature request-would be helpful if the dups list was colour-coded by container (or some other ID) and ability to select the tab in the correct container to keep (or maybe keep 2 selected tabs in 2 containers and delete the other 8 dups or in wrong containers!)

Outstanding for its ability to find duplicates across multiple windows.

Thanks Dev, for this add-on.
It has been doing a good job for months, but seems to be inactive since a few weeks.
My 5-star review stands anyway. Thank you again.