How do I make Mozilla not use its own email client when clicking on an email link?
Add the following line to the “prefs.js” file: user_pref(“network.protocol-handler.external.mailto”, true); Make sure that Mozilla is not running (not even in the background when “quick launch” is activated), or your changes might be overwritten when you close Mozilla. Mozilla should then use the system default mail client (e.g. Eudora, Outlook,…) when you click on an email link in a website.