Hi, thanks for your kind review.
The FF version had some troubles recently. I'll check on it!

UPDATE: the OAUTH problem has been fixed, lucky was caused by the recent FF add-ons site rejection. so I had to change some configurations on the Salesforce connected app. Now it works :)
For the double opening I'm found the cause and fixed the bug, but as this is a minor bug I'll publish it in the next release.
I suggest for the future to file a bug @ https://organizer.enree.co/support.html so I can reply directly to investiage the issue!
Thank you again!