How to completely remove add on?

[oelbaga]

How do you fully remove this add on from the system. I deleted the folder but I believe it leaves files behind in the storage? I'm getting this error after installing on the login page:

file_put_contents(/var/w...admin/storage/tmp/4cc5a0d2487ec7f4c75b0cc9115bf601.js): failed to open stream: Permission denied in
/var/www.../admin/lib/LimeExtra/Helper/Filesystem.php
on line
108