I think we have no work item here, as Bug 1614462 already removed mozbrowser support and no test is broken so far. AFAICT tests that use mozbrowser are already disabled, as stated in [#c11](https://bugzilla.mozilla.org/show_bug.cgi?id=1614478#c11)
Bug 1614478 Comment 13 Edit History
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I think we have no work item here, as Bug 1614462 already removed mozbrowser support and no test is broken so far. AFAICT tests that use mozbrowser are already disabled, as stated in [#c11](https://bugzilla.mozilla.org/show_bug.cgi?id=1614478#c11).