We have concluded that there are a number of potential localization impacts from switching the default font. In particular, the fallback behaviour when characters are missing from Inter can result in a regression in readability for certain locales / characters. We will not be doing this for now.
Bug 1680108 Comment 18 Edit History
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We have concluded that there are a number of potential localization impacts from switching the default font in the main browser UI. In particular, the fallback behaviour when characters are missing from Inter can result in a regression in readability for certain locales / characters. We will not be doing this for now.