Merge pull request #15482 from eeejay/bug-961169

Bug 961169 - [Settings] Clean up range inputs, and make them more screen... r=kaze
Bug 946812 - Disable test_camera_flash_modes.py (no flash)
Revert "Bug 946812 - Disable test_camera_flash_modes.py (no flash)"

This reverts commit a7437d8dbef18a955054b20a36b8a69beddee1b9.
Bug 946812 - Disable test_camera_flash_modes.py (no flash)
Bug 963350 - Make homescreen pages aria regions with size and position in set.