https://tbpl.mozilla.org/php/getParsedLog.php?id=9605827&tree=Mozilla-Inbound Rev3 Fedora 12x64 mozilla-inbound pgo test mochitests-1/5 on 2012-02-24 12:53:32 PST for push 736d27c50caa builder: mozilla-inbound_fedora64_test_pgo-mochitests-1 slave: talos-r3-fed64-069 starttime: 1330116812.91 results: warnings (1) buildid: 20120224120004 builduid: 4f480c2f475942f0b975a606f6af9953 revision: 736d27c50caa 72545 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] 36. Should exit full-screen mode after removing full-screen element ancestor from document 72546 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] 37. Should not have a full-screen element again. - null should equal null 72547 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] 38. Should be back in non-full-screen mode (third time) 72548 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Request for fullscreen should have been denied because calling context isn't trusted 72549 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should still be in normal mode, because calling context isn't trusted. 72550 ERROR TEST-UNEXPECTED-FAIL | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Moved to full-screen after mouse click 72551 ERROR TEST-UNEXPECTED-FAIL | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should still be in full-screen mode, because calling context isn't trusted. 72552 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should have left full-screen mode. 72553 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should have left full-screen mode (last time). 72554 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] document.mozFullScreenEnabled should be false if full-screen-api.enabled is false - false should equal false 72555 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should still be in normal mode, because pref is not enabled. 72556 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] document.mozFullScreenEnabled should be true if full-screen-api.enabled is true - true should equal true 72557 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [fullscreen] Should still be in normal mode, because iframe did not have mozallowfullscreen attribute. 72558 INFO TEST-PASS | /tests/content/html/content/test/test_fullscreen-api.html | [keys] Must be in full-screen mode

Comment 4 was actually bug 726540.

This has been fixed (or at least worked around) by the patch in bug 690989.