This test is trying to listen for AboutNetErrorLoad, which doesn't work if the iframe into which we're loading the error page is cross-process. Fixing this is fairly straightforward.

Backed out for causing perma fails on browser_bug633691.js.

Push with failure: https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=271402706&resultStatus=pending%2Crunning%2Csuccess%2Ctestfailed%2Cbusted%2Cexception&searchStr=linux%2Cx64%2Cdebug%2Cmochitests%2Cwith%2Cfission%2Cenabled%2Ctest-linux64%2Fdebug-mochitest-browser-chrome-fis-e10s-2%2Cm-fis%28bc2%29&revision=0999a4c81a05c47e77ab9e593ad2d7a3db5d4d09

Failure log: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=271402706&repo=autoland&lineNumber=4603

Backout: https://hg.mozilla.org/integration/autoland/rev/c7e591ee61c5368f31a48d6317d5521f16594db4

Should have taken out the info logging before pushing, oops. :-(

https://hg.mozilla.org/mozilla-central/rev/15dcfe42e6d0

Retroactively moving fixed bugs whose summaries mention "Fission" (or other Fission-related keywords) but are not assigned to a Fission Milestone to an appropriate Fission Milestone.

This will generate a lot of bugmail, so you can filter your bugmail for the following UUID and delete them en masse:

0ee3c76a-bc79-4eb2-8d12-05dc0b68e732