Let's be honest: With the decay rate of URLs, by the time you get back to that tab, there's like a 10% chance the page will be a 404.
I recommend aggressively archiving into Zotero or another tool, perhaps into an "unread" folder, so that at least it's possible to read any one of them.
That's actually really good point. Now excuse me while I have Firefox send your comment as a tab to my desktop to remind me to look for a good archiving extension :-)