Session buddy was a big one for me in college when I had an overwhelming number of tabs open but didn't want to forget about what was on them. Basically just archives all your open tabs to a single page you can refine and look back at, so you can quickly just close everything and start fresh without actually losing anything meaningful or cluttering up your bookmarks.

The marvellous suspender helped prevent those tabs from using so much memory. Chrome hogs enough memory as it is lol.

I have one called tab manager plus which looks handy but I honestly forgot it was there before I ever actually used it lol