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PWA Does Not Work with Firefox Closed

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Firefox 65 on Android 7.

I add a PWA to the Home Screen in FF. If I click on the FF HS Icon when FF is closed, all I get is a blank screen (PWA does not work). However, if I have FF open before I click the FF HS Icon, the PWA works. This is not the behavior observed using Chrome. The Chrome HS Icon works regardless of whether Chrome is running. I have tried this with several different PWAs and the result is the same.

I don't understand why this is happening in FF...

Firefox 65 on Android 7. I add a PWA to the Home Screen in FF. If I click on the FF HS Icon when FF is closed, all I get is a blank screen (PWA does not work). However, if I have FF open before I click the FF HS Icon, the PWA works. This is not the behavior observed using Chrome. The Chrome HS Icon works regardless of whether Chrome is running. I have tried this with several different PWAs and the result is the same. I don't understand why this is happening in FF...

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UPDATE. Today, after updating to version 66, this problem no longer occurs.