Using KMail from Firefox

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Question: 

How do I get Firefox to open mailto-links with KMail and use KMail from Tools/New Message?

Answer: 

For some reason this IMO important configuration setting hasn't made it into the Preferences dialog but it is available:

  1. Open the "about:config" page.
  2. Type "mailto" in the filter field.
  3. Check if you have a preference with the name "network.protocol-handler.app.mailto". If not, create one by right clicking and choosing New/String.
  4. The value of the preference should be "kmailservice".

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