Careful, if you close the active window by mistake, then re-open it, pinned tabs are lost.

this is one of my favorite addons! works just like it says it does. i dont have to go digging around windows to answer the message that came in or accidentally open the message window again because i closed the window the pinned tab was in.

A recommendation:

https://github.com/Drive4ik/simple-tab-groups/issues/286#issuecomment-787110861