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Firefox won’t load as default browser

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I have Firefox set as default browser but ms edge which is not set as default always fires up. Didn’t use to do this. Can’t figure it out

I have Firefox set as default browser but ms edge which is not set as default always fires up. Didn’t use to do this. Can’t figure it out

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Hi Mark, is this problem limited to links in the Office 365 Outlook desktop application? Outlook has its own setting to determine where links open, as described in the last section of the following article:

Setting Firefox as the default browser does not work - What to do

If other applications (or desktop shortcuts) are affected, which ones have the problem?