The bug there is https://bugzilla.mozilla.org/show_bug.cgi?id=1772264. What's your DPI settings in the OS (global zoom level on Windows or MacOS or Linux)?
Bug 1494772 Comment 17 Edit History
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The bug on Proton is https://bugzilla.mozilla.org/show_bug.cgi?id=1772264, so they're right we should fix it. What's your DPI settings in the OS (global zoom level on Windows or MacOS or Linux)?