Syncing wpt PR 36488 found new untriaged test failures in CI

Tests Affected

Firefox-only failures

• /html/browsers/browsing-the-web/navigating-across-documents/javascript-url-no-beforeunload.window.html [wpt.fyi]
  • Navigating an iframe via location.href to a javascript: URL must not fire beforeunload: string completion: FAIL
  • Navigating an iframe via src="" to a javascript: URL after insertion must not fire beforeunload: string completion: FAIL
  • Navigating an opened window via location.href to a javascript: URL must not fire beforeunload: string completion: FAIL
  • Navigating an opened window with an iframe via location.href to a javascript: URL must not fire beforeunload on the iframe: string completion: FAIL

CI Results

Gecko CI (Treeherder)
GitHub PR Head

Notes

These updates will be on mozilla-central once bug 1795635 lands.

Note: this bug is for tracking fixing the issues and is not
owned by the wpt sync bot.

This bug is linked to the relevant tests by an annotation in
https://github.com/web-platform-tests/wpt-metadata. These annotations
can be edited using the wpt interop dashboard
https://jgraham.github.io/wptdash/

If this bug is split into multiple bugs, please also update the
annotations, otherwise we are unable to track which wpt issues are
already triaged. Resolving as duplicate or closing this issue should
be cause the bot to automatically update or remove the annotation.