Font sizes are different in Firefox and Chrome

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Do you mean it’s bigger in Firefox?

If so, have you changed layout.css.devPixelsPerPx in the Firefox config?
I tested, and at first glance, I could see the difference too:

The image shows a Discord topic asking why fonts appear different in Firefox and Chrome, with a similar view being shown on two screens. (Captioned by AI)
The image shows a Discord topic asking why fonts appear different in Firefox and Chrome, with a similar view being shown on two screens. (Captioned by AI)2341×826 152 KB

Then, after debugging, I found out that the pixel ratio was set to 1.09 for some reason.

I don’t remember modifying it; that’s odd. To reset it:

Now, it’s similar:

The image shows side-by-side screenshots of a single chat post in a Slack and Discourse forum, highlighting the differences in UI layout and features. (Captioned by AI)
The image shows side-by-side screenshots of a single chat post in a Slack and Discourse forum, highlighting the differences in UI layout and features. (Captioned by AI)2553×811 223 KB

Is it your case as well?

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