FIX IT Rated 2 out of 5 stars
Thanks for updating this for 7.0.1. I installed it - opened the addons tab - FF froze. I realized it was deleting my history based on its default setting - EDIT : according to the dev it was not - ok - please add a window in start up as detailed below /EDIT. I switched to another open window which was not frozen and hit exit. Reopened FF and let it open all night - in the morning still frozen. Exited same way and opened MyProfile\extensions and deleted the damn thing - then restored my history - happily I could.
You should have a window pop up on first run for the user to set expiration and all - with an option to do it later - and till then have this sleep (EDIT : suposedly it slept). What would I do if I had no other windows open (you forgot about them happily) - kill the process ? And when I exited and restarted the addon did not expect it and just sat on an infinite loop. Well done !
EDIT : my places was not corrupt - I had tested it with your other addon
The addon does not do anything till you change the options value to a certain amount of days, and it does its work on idle, so I can't see what may have happened in your case, unless the database was corrupt. I'll double check to see if it may have done something unexpected.