First you need to work with the add on author for support for any 3rd party add ons. Then ask Firefox questions in that forum and not the Thunderbird forum.

Yes, as one can see, my question specifically stated this problem occurred in Firefox 37. I did not say Thunderbird. So I will contact Sticky Password concerning the problem.

Then try asking Firefox questions in the FIREFOX forum as I specifically stated in my answer. This is the Thunderbird forum

Changed the Product forum this thread is in from Thunderbird to Firefox so no need to create a duplicate thread.

This is a Extension in Firefox and not a Plugin like Flash or Java.

Also you are Testing builds on the Beta channel (currently at 37.0b3) and Extensions like these tends to only support the current Release at most which is Firefox 36. www.mozilla.org/firefox/all/

In the Sticky Password software you can go to "Settings - Supported browsers and install the extension" as I guess that may be where there are updates? https://support.mozilla.org/en-US/questions/948577

And where, may I ask, is the Thunderbird word on this Mozilla support forum page that would lead me to know that? And why was that question directed toward you in thew first place?