Bug 1533955 - Show some UI to indicate that a subframe has crashed. r=NeilDeakin
Differential Revision: https://phabricator.services.mozilla.com/D29238 --HG-- extra : moz-landing-system : lando
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Differential Revision: https://phabricator.services.mozilla.com/D29238 --HG-- extra : moz-landing-system : lando