Where did you get 129, since it has not been released yet?

Since the version is not displayed unless help is selected I mis-named the versions.

I went from 127 to 128 and 128 is broken. See the screen shot for one of the problems.

Here is the screen shot from a Reply email. This where I was trying to reply to an email and I get bad graphics.

please click the alt key and then click help>about and post screenshot of the version you're using. We need to confirm that before advising on reverting to a prior version. Thank you.

Your above instructions were incorrect as with my system all I had to do is click [help] and then use the pull down menu to [About Firefox}, which will render the screenshot being uploaded. Thanks for the suggestion though.

Ok, before downloading a new version, click Tools>addons&themes and try another theme. that may address the color issue.

Thanks for the suggestion. I tried about 8 different themes and it did not help the reply rendering of the email that a reply was being written.

I un-installed the POP!-Deb version of T-Bird and installed Flatpak version both of the same version number. That solved almost all of the problems. From that I believe the Ubuntu version has the problems and not the Flatpak version.

Thanks for all the help.

I was glad to assist. I remain a novice for Linux, but I enjoy reading the various solutions. :)