Nika Layzell 08996b5877 Bug 1650089 - Part 8: Avoid race when calling loadContentPage with about:blank, r=kmag
Without this change, there was a race where the promiseBrowserLoaded promise
from the loadURL call could return early due to observing the load completing
for the default about:blank document, rather than for the second explicit
about:blank load, leading to intermittent timeouts due to loads interrupting
one-another. This change skips the default about:blank document load with
nodefaultsrc, avoiding the issue.

Differential Revision: https://phabricator.services.mozilla.com/D121778
2021-08-10 14:31:19 +00:00
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