ensure that Gnome "Large Text" accessibility setting is not a fingerprinting vector

From #33534 (closed): Added in Firefox 73: Firefox now preserves font scaling applied by Gnome's "Large Text" accessibility setting. Is this a fingerprinting vector?

https://bugzilla.mozilla.org/show_bug.cgi?id=1604761
"Firefox doesn't apply gnome "Large Text" accessibility setting to web content"

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