Open URLs in Icedove emails in Iceweasel, how?

[Ken Heard <kenslists@teksavvy.com>]

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I am using Jessie with the latest versions of icedove (31.7.0-1) and
iceweasel (31.7.0esr-1~deb-8ul) installed.  update-alternatives
- --config x-www-browser already points to iceweasel %u.  In addition
file ~/mozilla/icedove/9vgk89rr.default/user.js contains the following
two lines:

user_pref("network.protocol-handler.app.http", "iceweasel %u");
user_pref("network.protocol-handler.app.https", "iceweasel %u")

But still I cannot open URLs in icedove emails automatically in
iceweasel.  What else do I need to do to activate this feature?

Regards and thanks in advance for any help provided,

Ken Heard
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