Can you send email about your issues

can you send screenshot detail this issue to email pentest137@gmail.com

yes of course. You can use both chrome and firefox with one license.

Thanks for your feedback, new firefox does not support user interface below address bar. Devtool space is best which I chose.
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/user_interface

Thanks for your review, I'll add more features in next version