Yup, that was the common suggestion I was finding, but no luck with it on or off.

Not the commenter, but…

I play tabletop RPGs (Pathfinder 2e for those care) online with some friends, and we use a website which hosts the program (forge-vtt.com).

For the life of me, I cannot get it to behave on Firefox. Maps will be pitch black while on Chrome they render perfectly. I’ve tried every permutation of browser setting and extension toggling I can think of to no avail.