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Links Not Opening Up in the Browser

If links are not opening up in the browser, here are few things to try:

1)  Change your default browser to another browser and then change it back.

In some scenarios after a browser update, the OS setting for the default browser fails to get updated.

2)  Use the Postbox Config Editor and make sure the hidden network.protocol-handler.external-default preference is set to true.

3)  Use the Postbox Config Editor and make sure the hidden network.protocol-handler.warn-external.http preference is set to false.

Certain add ons (like ThunderBrowse) can leave these hidden prefs in the wrong state after uninstall.