Weird Font Rendering in Browser

Hello everyone!

New openSUSE Tumbleweed user here on a new install of Tumbleweed.
I encountered the following problem when browsing the web using firefox:

Some websites, Reddit most notably, render fonts very weirdly with lots of space, looking as follows:

Screenshot From 2026-02-10 20-02-58

Any idea what could cause this? It’s a fresh firefox, no add-ons installed yet.

Update 1:
Tried out the following additional browsers:

  • Vivaldi (Flatpak)
  • Brave (Flatpak)
  • Chromium (Flatpak)

All of them work fine and render fonts properly. Only the native installation of Firefox behaves like that.

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