Bugzilla

### Beta/Release Uplift Approval Request
* **User impact if declined**: See Bug 1560990.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: No
* **If yes, steps to reproduce**: 
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: This simply makes it so that a nonstandard pref setting is ignored. The behavior is pretty broken on beta anyways, so it isn't likely anybody is going to be using it for much. (This wasn't verified in Nightly, but the patch does not actually change behavior on Nightly, only on Beta and Release. I did a try push with the pref locked, against trunk, and it was okay.)
* **String changes made/needed**: none

### Beta/Release Uplift Approval Request
* **User impact if declined**: See Bug 1560990.
* **Is this code covered by automated tests?**: Yes
* **Has the fix been verified in Nightly?**: No
* **Needs manual test from QE?**: No
* **If yes, steps to reproduce**: 
* **List of other uplifts needed**: None
* **Risk to taking this patch**: Low
* **Why is the change risky/not risky? (and alternatives if risky)**: This simply makes it so that a nonstandard pref setting is ignored. The behavior is pretty broken on 68 anyways, so it isn't likely anybody is going to be using it for much. (This wasn't verified in Nightly, but the patch does not actually change behavior on Nightly, only on Beta and Release. I did a try push with the pref locked, against trunk, and it was okay.)
* **String changes made/needed**: none