Broken font rendering with Firefox on Plasma 6 Wayland

Firefox remains the last broken application after I switched to Wayland after Plasma 6 release with the fonts not being anti-aliased properly and look very thin. It is most visible in GMail as well as some other sites. I am using Firefox from Flatpak (so that I don’t have to mess up with codecs), and fonts look really beautiful on X11. I just upgraded from an NVIDIA to an AMD GPU, but the fonts look equally ugly on both. I’ve googled the problem and tried a few solutions (such as this one Font is not antialiased with GTK apps on wayland · Issue #2861 · flatpak/flatpak · GitHub) but none worked. My other Tumbleweed installations on laptops with Intel graphics show no such problems. If anyone has dealt with this issue, I’d be really really thankful!

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