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Links inside emails won't open

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Since today I click on any link inside emails and it won't open on the default browser. I observe that clicking on links is behaving differently. Instead of calling the default browser, Thunderbird is trying to use the http link as a "feed subscription". And I get a message accordingly. See screenshot attached.

Since today I click on any link inside emails and it won't open on the default browser. I observe that clicking on links is behaving differently. Instead of calling the default browser, Thunderbird is trying to use the http link as a "feed subscription". And I get a message accordingly. See screenshot attached.
Attached screenshots

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Did you install any add-ons recently?

Please post your Troubleshooting Information. At the top right of the Thunderbird window, click the menu button , then select Help > Troubleshooting Information. Press the "Copy text to clipboard button" and paste the information into your reply.

Is there any difference when starting Thunderbird in safe mode? https://support.mozilla.org/en-US/kb/safe-mode-thunderbird

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It worked later but I dont know why. After changing the setting for Firefox as default browser I think it caused this. Really weird... Then I tried again to change the same option and works.