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6.2. Pango Text Renderer for Firefox

Fedora is building Firefox with the Pango system as the text renderer. This provides better support for certain language scripts, such as Indic and some CJK scripts. Pango is included with with permission of the Mozilla Corporation. This change is known to break rendering of MathML, and may negatively impact performance on some pages. To disable the use of Pango, set your environment before launching Firefox:
MOZ_DISABLE_PANGO=1 /usr/bin/firefox

Alternately, you can include this environment variable as part of a wrapper script.