Bug 968083 - Intermittent fail in test_import_contacts_from_sim
Bug 957674 - adding an easy way to enable/disable a screen reader.
Merge pull request #16051 from yzen/957674

Bug 957674 - adding an easy way to enable/disable a screen reader. r=alive
Bug 970458 - Disable failing clock tests on TBPL/Gu a=testonly r=me
Merge pull request #15970 from AndreiH/bug968083

Bug 968083 - Intermittent fail in test_import_contacts_from_sim
Bug 937336 - Remove explicit frame switching