Not sure if it's too niche, but I thought it might be a useful idea to have sort of "tab loadouts". A feature where you can simply click on a loadout you built yourself and have it open up whatever tabs you need at once. For example, opening up several different guides to a game at the same time, maybe because each guide covers slightly different angles. Or a loadout that opens up your math class website alongside multiple different online calculators. That way, you won't have to leave so many different tabs open and eat up your computer memory because you still need to use the browser for other purposes at the moment, but don't want to go through the hassle of opening up all those tabs again that you aren't using right now.