I'd love a "Bookmark selected tabs" kind of function that lets me quickly click on a dozen or so relevant tabs. Usually, I'll have 20+ tabs open with 5-10 on a given subject, so "Bookmark All" captures a lot of useless tabs.
Better yet, a "Bookmark similar subject" plugin would be awesome - Leverage Google's search to automatically figure out tabs that are about the same thing and bookmark them by subject. Ignoring pinned tabs would be a bonus.
Usually I find tabs I want are next to each other, or easy to drag together. If there are a log of tabs in the window that I don't want then I use the Tab Split Extension[1] to put them in another window, or I just edit the bookmarks once I've created them.
Better yet, a "Bookmark similar subject" plugin would be awesome - Leverage Google's search to automatically figure out tabs that are about the same thing and bookmark them by subject. Ignoring pinned tabs would be a bonus.