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Have recent updates fixed conflict with Windows 10 security?

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Have had to restore earlier versions of Firefox in order to continue using it on this Windows 10 desktop. Latest versions of Firefox fail to open directly or via email links, and are apparently blocked by some setting within Windows 10 Defender and/or Firewall.

Have had to restore earlier versions of Firefox in order to continue using it on this Windows 10 desktop. Latest versions of Firefox fail to open directly or via email links, and are apparently blocked by some setting within Windows 10 Defender and/or Firewall.

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You can adjust your UAC settings and firewall settings by searching for UAC or firewall on windows 10 to see if maybe they're blocking or restricting FF access or something.