With the current patch we'll be only allowing this to be available to non-debug and Nightly builds. The intent is to eventually remove these checks in Bug 1750998 and uplift once Bug 1749819 has been resolved. This should also give us more time for testing this in Nightly and let us catch any new bugs that our existing tests weren't able to detect.
Bug 1670108 Comment 12 Edit History
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With the current patch we'll be only **allowing this to be available to non-debug and Nightly builds**. The intent is to eventually remove these checks in Bug 1750998 and uplift once Bug 1749819 has been resolved. This should also give us more time for testing this in Nightly and let us catch any new bugs that our existing tests weren't able to detect.