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Firefox issues in rendering variable font weight (Montserrat)

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I encounter a problem with the font rendering of some websites. The problem is similar to [one], however I am on a recent Linux distribution (Fedora 41).

Firefox: 137.0

When browsing, as an example, [OpenMediaVault forum], the Montserrat font is rendered as "thin" (weight 100), even if the style mandates a weight of 400.

The font is rendered properly when Firefox is loading the font from the website (in woff2 format).

If the font is available locally, then Firefox does not scale it and defaults to "thin". Using "Inspect", the weight slider appears but moving it is ineffective.

Now, Fedora ships by default with a non-variable release of Montserrat. However, even replacing it system-wide with the variable version (ttf, in case it matters) taken directly from the Montserrat upstream repo, Firefox still fails to scale it.

Any troubleshooting help would be appreciated.

I encounter a problem with the font rendering of some websites. The problem is similar to [[https://support.mozilla.org/si/questions/1432102|this one]], however I am on a recent Linux distribution (Fedora 41). Firefox: 137.0 When browsing, as an example, [[https://forum.openmediavault.org|the OpenMediaVault forum]], the Montserrat font is rendered as "thin" (weight 100), even if the style mandates a weight of 400. The font is '''rendered properly''' when Firefox is loading the font from the website (in woff2 format). If the font is available locally, then Firefox does not scale it and defaults to "thin". Using "Inspect", the weight slider appears but moving it is ineffective. Now, Fedora ships by default with a non-variable release of Montserrat. However, even replacing it system-wide with the variable version (ttf, in case it matters) taken directly from the Montserrat upstream repo, Firefox still fails to scale it. Any troubleshooting help would be appreciated.