Expose mailto handler pref (and create prefs for other protocols)

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Ken Watanabe reports,

http://mozilla.gunnars.net/mozfaq_use.html

I copy/pasted the relevant portion below:

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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.

This is easy, but needs strings, so 9.3.2.

Original issue reported on code.google.com by classi...@floodgap.com on 26 Jan 2012 at 3:35

• Blocking: #25

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Original comment by classi...@floodgap.com on 26 Jan 2012 at 3:36

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For 9.3.1, expose the pref in about:config so people don't have to go mucking 
around in BBEdit.

Original comment by classi...@floodgap.com on 26 Jan 2012 at 3:51

• Added labels: Milestone-Release9.3.1
• Removed labels: Milestone-Release9.3.2

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Installed

Original comment by classi...@floodgap.com on 20 Feb 2012 at 4:59

• Changed state: Started

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Original comment by classi...@floodgap.com on 19 Oct 2012 at 4:49

• Changed state: Verified