Is not there some trouble since some weeks ?
I suppress everything excepted passwords, for all time, not reloading tabs. When it is done, I go to Firefox options, Privacy and Security. Then, I can see some things remain in cache or site's data.

This is the best cleaning extension among others. It cleans the cache, history whatever I want. It has lots of options and lets me to choose which things to be removed or not. I recommend this extension to you people.

Works good!!

nice add on, but can developer add duration of notification setting

Does exactly what it says it does, just don't press the buttons haphazardly like I did

Please add option to clear data on exit or startup.

Einmalig !!