It seems like it's a bug/feature of firefox on linux : https://bugzilla.mozilla.org/show_bug.cgi?id=47752 I'll close the ticket as a "won't fix", because this is a divergence in the behaviour of browsers that we can't really fix without bringing in even more inconsistencies (assuming a technical fix would even be possible). Firefox resolves the CSS generic keywords such as `cursive` and `fantasy` by relying on the OS fontconfig aliases (but this fontconfig at the OS level is not consistent and usually empty for fantasy on Linux) while Chrome bundles its own font-substitution table. Ultimately it's an incompatibility between the choices made on Firefox and https://www.linuxfromscratch.org/blfs/view/svn/x/tuning-fontconfig.html that ends up in this unexpected behavior.
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