It often loses the settings for my NAS, causing me to end up clicking lots of things to download, only to have them not be sent to the NAS (I also rarely see the 'failed to connect' pop up error that I should in that case).
Every time, I have to go to the extension's options and reenter all the connection settings and options, as if it's a clean install.
This isn't every day or reboot or anything like that (where I might realise the cause), but happens randomly perhaps roughly once a week or two.
I'm not doing anything myself to cause this; I don't even allow FF to auto-update itself although I do keep extensions on automatic. Perhaps it's when this gets an update?
From https://addons.mozilla.org/en-US/firefox/addon/nas-download-manager/reviews/1738623/