Created attachment 860241 [details]
Screenshot of PDF incorrectly rendered in greyscale

Open any PDF with coloured text and/or images, Firefox (since version 102 and
currently with 102.1) renders them in greyscale. Same PDFs were correctly
rendered by versions 101.x and earlier.

OS: openSUSE Tumbleweed 20220714
Desktop: GNOME 42.3 on Xorg/Wayland

For example, see attached screenshot for rendering of Ffx (left) vs Evince
(right) of the same PDF from:
https://arxiv.org/pdf/1502.01076.pdf

Happy to help with any additional info if/as directed.