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Re:Tor at the Heart: Firefox by BuuQu9hu on Wednesday January 04, 2017 @12:44AM (#13315951)
Disable looking at the metrics of text rendering results?
Re:Tor at the Heart: Firefox by gsnedders on Wednesday January 04, 2017 @06:25AM (#13317311)
Get two block level elements, render some text in between, and calculate how far apart the two block level elements are, and you can already determine the height of the glyph.

So, yeah, to disable that you'd have to entirely disable the CSSOM, which would cause ridiculous amounts of breakage.