New
#691
They marked it as Resolved and as a duplicate of another bug that is a bunch of codes and mess. After doing some more digging, it is because TT DeepDark addon that is my dark theme does not support Tbird above 61.*
I switched to the "Dark" default addon and in 60.4.0 and the Events bar was white as in 65b1. This appears to be the issue. I will have to wait on installing anything newer than 61 for TT DeepDark to update for it. Happy with what I have for now, so no problems.