Rated 5 out of 5 stars

Thank you for getting on it so fast, so far, it "looks" as though the issue has been cleared up, Cannot thank you enough, TY!

This review is for a previous version of the add-on (9.9.1.1-signed). 

Hello Us2inVa2,

I figured out that another add-on is causing this problem. I reported the bug to the add-on developer but meanwhile I coded some fallback mechanism which can take action in such kind of unexpected situation. Could you install v9.3.3 and feedback please? After you install v9.9.3, "Restart" is "required" to clean up old UI details.

https://addons.mozilla.org/en-US/firefox/addon/download-status-bar/versions/9.9.3

Cheers