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Default browser not opening when link is clicked

In some recent TBird versions clicking a link in emails no longer opens a page in the default browser. It is often possible to fix that with the following procedure (details in the last part of this blog post.):

  • Click Preferences > Advanced, General tab: click the Config Editor button at the bottom.
  • Search for the following lines:
    • network.protocol-handler.warn-external.http
    • network.protocol-handler.warn-external.https
    • network.protocol-handler.warn-external.ftp
  • Double-click the value “false” to change it to “true

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