I'm both a Backrooms fan and a bit of a tab-hoarder. This is the extension that I never knew I needed!

First off, I absolutely love your description! The references to tabs going into The Backrooms had me in laughter! But it also shows you're a Backrooms fan as well.

I've only just downloaded the extension and I already know it's going to be so useful. I usually end up opening another Firefox window and filling that with tabs until I'm bothered to go through them. Now I can just not worry about them all as they no-clip into the Backrooms of Firefox!

Also love the mono-yellow of the extension menu and "Backrooms". Just so perfect!

My only suggestion would be to allow for a longer period of time before tabs disappear. I know I can add protected tabs/URLs (which is absolutely necessary for me as I use my browser for my website and content research). But a lot of sites that I open, I need to have active for a few days, so I don't really need to permanently protect them - but I don't really want them to go to The Backrooms after a few hours either.

I also can't believe that this hasn't been installed more. I'm going to post it on some of my Backrooms socials and let other Backrooms fans know about it!