[Bug 1229059] Re: Firefox 24 uses stale manual proxy settings when configured to use system proxy settings, and system proxy settings are set to "None"

[Marian Hello]

Still valid in Ubuntu 16.04.1

How to reproduce (set some invalid host and port

gsettings set org.gnome.system.proxy mode 'manual'
gsettings set org.gnome.system.proxy.http host 'nonexistinghost'
gsettings set org.gnome.system.proxy.http port 9999
gsettings set org.gnome.system.proxy mode 'none'

Expected outcome: FF will not use any proxy and any website will be normally accessible.
Actual outcome: Visiting any page result in: The proxy server is refusing connections

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Title:
  Firefox 24 uses stale manual proxy settings when configured to use
  system proxy settings, and system proxy settings are set to "None"

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