Rated 5 out of 5 stars

I have now confirmed the add-on does work for TB 78.5.1 (32-bit), however, you have to make sure that under "Tools\Options\General\Language & Appearance\Fonts & Colors\Colors\Override the colors specified by the content with my selections" you have selected "Never" or "Only with high contrast themes". If you select "Always" it breaks the app.
This app makes it easy to instantly select previously selected colors, saving several clicks and time from doing it the traditional way. Thumbs up!!

Yes, with this setting set to "Always" it seems like TB takes full control over the colors and it's impossible to change the font color even via the standard "Choose color for text" dialog. And it also ruins the popup.

I've added your note to the add-on's description. Thanks for finding this issue.