[Bug 1226537] [NEW] System proxy settings doesn't work in Firefox when URL is a numeric IP address

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[Impact] 
When entering URLs with IP adresses in Firefox, those IP addresses are not matched correctly to the "ignore hosts" setting, when having configured Gnome proxy settings and using "Use system proxy settings" in Firefox, because the IP addresses get converted to IPv6 but not the netmask/prefix.

[Test Case]
 1. Set up a fake/invalid HTTP proxy server in Network options from 
    "System Settings->Network->Network Proxy "
 2. Try to go to google.com (make sure it's not https if you only set a http proxy)
 3. Try to go to 173.194.36.14 (use "ping google.com" to see IP)

Actual Results:
    Google.com fails (which is good); but 173.194.36.14 succeeds
Expected Results: 
    They should both fail with a non-working proxy server
Note:
  doing this "backwards" because it's easier to reproduce on you don't have to care about having a real proxy server.

[Regression Potential] 
  * None that I could see.

[Other Info]
  * The patch is pulled from https://hg.mozilla.org/mozilla-central/rev/b936f0735ad8 .

** Affects: firefox
     Importance: Medium
         Status: Fix Released

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: patch precise saucy
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System proxy settings doesn't work in Firefox when URL is a numeric IP address
https://bugs.launchpad.net/bugs/1226537
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