It fell asleep, archived the whole window, but I couldn't open it back. But fortunately I didn't have to open 520 tabs one by one. The shortcut Ctrl + Shift + N helped me a lot.

putting any tab to sleep crashes FF 129.0.2 on MX-Linux 23.3

I saved 2 windows. 1 window restored, 1 failed to. Managed to open tabs one by one

I just saved a window with 12 tabs, and now I can't open them back up! Beware of this buggy extension. I can still see the saved window in the extension's menu, but clicking the button to restore the window doesn't do anything.

Maybe allow us to export/import the list of tabs in a saved window as a block of text with a URL per line, so that I don't lose my tabs when this app decides to be buggy like this!

EDIT: It looks like you can open the saved tabs in the current window by clicking on each tab listed, so there is a work around for this broken restore button, but still not polished and very annoying.

This addon idea nice but it's very bare bones and seems to have a few bugs like Runafuru said (comment below). It would be nice if you could list all the tabs and be able to open one or more of them instead of all or none. It would be also nice to be able to edit the saved tabs to remove them or re arrange them inside the group or move them from one group to the other. It would be nice to be able to see their favicon and url of the saved tabs.

BTW I wanted to contact you trough the issues section of github to have a better conversation about this but it seems like your repository does not have one it only has pull requests.

Perfectly removes all your tabs and provide fresh and empty window... just after firefox restart it seems to be unable to find your previously put to sleep session... so great and useless -.-