Bug 1041475 - TEST-UNEXPECTED-FAIL | mozmill/content-tabs/test-install-xpi.js | test-install-xpi.js::test_install_corrupt_xpi + test-install-xpi.js::test_install_xpi_offer + test-install-xpi.js::test_xpinstall_disabled + test-install-xpi.js::test_xpinstall_actually_i (port bug 952201). r=mconley, a=jcranmer