Nothing really seems to use `apz.allow_zooming_out` per [my Searchfox result](https://searchfox.org/mozilla-central/search?q=allow_zooming_out&case=true&path=), though.
Bug 789906 Comment 80 Edit History
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~~Nothing really seems to use `apz.allow_zooming_out` per [my Searchfox result](https://searchfox.org/mozilla-central/search?q=allow_zooming_out&case=true&path=), though.~~