Bug 1104433 part 1 - Update test_error_events.html to set allow_uncaught_exception; r=Ms2ger
Bug 1104433 part 2 - Update dom/imptests/testharness.js and friends; rs=Ms2ger
Bug 1104433 part 3 - Extend the timeout of dom/imptests/editing/conformancetest/test_runtest.html; rs=Ms2ger