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Firefox will not delete Yahoo mail message if Yahoo App is installed

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This started happening recently. Firefox will not delete Yahoo mail message if Yahoo App is installed.

It keeps asking to use the app. Used to be you would click on CANCEL and everything would go through.

As soon as Yahoo App is UNINSTALLED, everything starts working. I tried installing a Yahoo App version from a year ago, and still the problem reappears.

Is there any way to just set things so Firefox NEVER asks to use Yahoo App? I want it to use other apps , just not Yahoo Mail.

This started happening recently. Firefox will not delete Yahoo mail message if Yahoo App is installed. It keeps asking to use the app. Used to be you would click on CANCEL and everything would go through. As soon as Yahoo App is UNINSTALLED, everything starts working. I tried installing a Yahoo App version from a year ago, and still the problem reappears. Is there any way to just set things so Firefox NEVER asks to use Yahoo App? I want it to use other apps , just not Yahoo Mail.