How do I get Firefox to open mailto-links with KMail and use KMail from Tools/New Message?
For some reason this IMO important configuration setting hasn't made it into the Preferences dialog but it is available:
- Open the "about:config" page.
- Type "mailto" in the filter field.
- 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.
- The value of the preference should be "kmailservice".