I really like this idea. I use Pocket pretty heavily for bookmarking, but there has been something off about it and nearly any other solution that I used that I couldn't quite pinpoint. I think this is part of the issue. I save a set of bookmarks on a topic over a period of time, but it isn't easy to get access to all of those bookmarks again. Searching doesn't quite accomplish the goal because I might have been looking into a similar topic months ago, but a search will return results from both "mental sessions" together and I have to separate them myself.

I have tried saving all of my bookmarks also, but then I usually have to remove my pinned tabs that are part of my overall workflow and not part of the mental session.