EDIT:


Many thanks dev team, the reset solution solve the memory leak issue.
Back to 5 stars !

I had to retry several times because even getting the settings tab clicking on the icon was imposssible due to memory leak bug triggering immediately after start.

So you're probably right the extension storage was corrupted after upgrade and caused this bug.

Why not releasing a new version which auto-resets at first start after installation in order to solve the issue for everyone ?

I used this shortcut to get into the settings without the annoying button bug (UUID should be different, identify with Firefox "about:performance" tab):

moz-extension://b3f1c4cd-c575-44b6-b256-5524cf739da3/ui/frontend/dist/settings.html

Then, first reset try hanged (memory leak again).
Next time I uninstalled extension/ restart Firefox / reinstalled the extension and used the reset option again which at last succceeded

thank you for posting this solution !