I'm going to be working with @kyrios on making a modification to our vendor prefs.js to hopefully enforce widget.content.gtk-theme-override as Adwaita:light. I've already validated that it works against Plata-Noir and Plata-Lumine, and it is the most optimal solution IMO compared to installing an add-on (which we can do, there are vendor paths for, but to summarize it in one word: "eh").
Would make the change myself but I don't exactly have my beefy desktop sitting next to me at the moment.
You can expect an out-of-band sync for firefox (as well as some package updates I'm getting in like Telegram 1.6.1 just so it removes the pesky update notification for people).
