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Firefox wont stay as default browser

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For the last few days Firefox keeps dropping off as the default browser and seems to be defaulting to the Avast Secure Browser thats installed instead.

I keep changing it back via both Firefoxs settings and via Windows default settings but within 10 minutes it falls off again.

How can I make sure Firefox stays as my default browser?

For the last few days Firefox keeps dropping off as the default browser and seems to be defaulting to the Avast Secure Browser thats installed instead. I keep changing it back via both Firefoxs settings and via Windows default settings but within 10 minutes it falls off again. How can I make sure Firefox stays as my default browser?

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