Since the Harfbuzz is only one working shaper for Mongolian (except on Windows), it makes sense if it is turned on by default.
Created attachment 668776 [details] Before setting gfx.font_rendering.harfbuzz.scripts in about:config (default)
Created attachment 668777 [details] After setting gfx.font_rendering.harfbuzz.scripts to 23 in about:config
Status: UNCONFIRMED → RESOLVED
Last Resolved: 5 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 797402
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