When I have a bunch of tabs open, the "close all but this" option is very useful. There are times that I'd like to keep 2 or 3 windows open. Is there a way to multi-select the tabs I want and "close all but selected"?
I use the Productivity Power Tools extenstion which allows you to 'Pin' pages on the editor frame, among other awesome features.
•Pinned tabs
Allows you to pin tabs to keep them always visible and available.
Then there is the option to "Close all but pinned"
That should do exactly what your trying to accomplish.
From the File, Edit, View menu: Window > Windows…