For future reference for figuring out which release had what: * Firefox 147 did not have the issue: sync about:blank was not there. * Firefox 148 didn't work in old ZE: sync about:blank was there but the fix from this bug was not. * Firefox 149 has the fix without a console message in dev tools and without the use counter. * Firefox 150 has the fix with a console message in dev tools and with a use counter. In all cases, the latest ZE doesn't have a problem.
Bug 2020668 Comment 48 Edit History
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For future reference for figuring out which release had what: * Firefox 147 did not have the issue: sync about:blank was not there. * Firefox 148 didn't work with old ZE: sync about:blank was there but the fix from this bug was not. * Firefox 149 has the fix without a console message in dev tools and without the use counter. * Firefox 150 has the fix with a console message in dev tools and with a use counter. In all cases, the latest ZE doesn't have a problem.