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**** Description of problem:

Proxy autoconfig scripts which depend on DNS resolution block the entire firefox GUI.


**** Version-Release number of selected component (if applicable):

firefox-10.0.7-1.el6_3.x86_64


**** How reproducible:

very frequently


**** Steps to Reproduce:

1. Use a slow DNS server.

2. Specify a local proxy autoconfig file in

Edit | Preferences | Advanced | Network | Settings | Automatic proxy configuration URL

such that the script uses the dnsDomainIs() and isInNet() JavaScript functions. For examples, see <https://bugzilla.mozilla.org/show_bug.cgi?id=235853>

3. Try to scroll one (fully loaded) tab, or enter text on it, or change its location bar, while another tab is loading.
  

**** Actual results:

Watch the GUI freeze intermittently for seconds.


**** Expected results:

One tab being blocked on hostname resolution should not affect another tab, and definitely not the entire GUI.


**** Additional info:

Please work with Mozilla so that <https://bugzilla.mozilla.org/show_bug.cgi?id=769764> is backported to Firefox ESR.

That way (I hope) the fix would end up in RHEL-6 too.

Thank you.

Development Management has reviewed and declined this request.
You may appeal this decision by reopening this request.