Review Mozilla 2002635: Unship asm.js

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=2002635

Description

Probably needs a review in general.

In particular, this switched javascript.options.asmjs from true to false, by default. Our lowest security level expects javascript.options.asmjs to be true.

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