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![Emilio Cobos Álvarez](/assets/img/avatar_default.png)
We can't observe when the sub-document gets detached from the root document to drop the observation, so this is the sound thing to do. Differential Revision: https://phabricator.services.mozilla.com/D65362 --HG-- extra : moz-landing-system : lando
Common testing tools for mozilla codebase projects, test suite definitions for automated test runs, tests that don't fit anywhere else, and other fun stuff