It won't save changes to settings, and the default ones are unfortunately pretty awful.

Does what it says. I do wish the default was not so short however, I had well over 1000 tabs open when I installed it (including ~20 i was using today) and it just immediately closed almost all of them. This is sort of what I wanted, but I would have liked to keep the ~20 I had opened today. I'm using tab tree so this is sort of reasonable. I'm aware that I am an outlier, though.

Appears to work, just after install. I configured it to clean up tabs after 2 weeks, with a minimum of 40 tabs. Thanks for the extension!

EDIT: 3/7/23

This is still a very annoying problem 5 years later, I've had to reinstall all my plugins a few times in the past year and every time it breaks my workflow badly.

My personal settings are:

delay: 1440 minutes (1 day)
min tabs: 20

I only wish I could set them before the plugin gets triggered after install.