Inbox, rather than bookmarks. Bookmarks suggest repeated visits; an open tab is something to be visited at least once, but not known to be worth keeping a link to.
Open tabs = bookmarks for unread stuff, basically. Once I’m done, optionally bookmark it if necessary and close the tab.
The problem with bookmarks is my list of bookmarks eventually grows even larger than my open tabs, far larger, and stuff just gets lost in there. Once out of site, then out of mind. Leaving it open in a tab I’m more likely to go back and read it when I have time.
If I have too many tabs open, I just bookmark and tag the site I still may want to want peruse later, and close the tab.