I have problem with Firefox(31.0) on my Windows(7). I don't want that Firefox use system proxy, and for this issue, set "No proxy" in Options/Advanced/Network/Settings. But when I close Firefox then open it, this option changed to "Use system proxy".
I do this config in "about:config" manually.(set '0' in network.proxy.type) But similarly when Firefox restarted, this value changed to '5'.

How can i set permanent config for this ?

  • 1
    This shouldn't happen. Is this machine under your control or is it part of a corporate network? – Paul Sep 1 '14 at 5:59
  • Unfortunately This happens and cause of confusing. My PC is connected to network, but is not under control somethings like domain. – M-Razavi Sep 1 '14 at 6:15
  • Have you had any trouble with viruses recently? Some set the pref.js file to read only, or it can be corrupted. Have a look at the properties of C:\users\[userid]\appdata\roaming\mozilla\firefox\profiles\xxxxx.default\prefs.js and see if it is read-only (after closing firefox) – Paul Sep 1 '14 at 6:43
  • 1
    Disable all addons and plugins. If dont work try create new user. – crazypotato Sep 1 '14 at 6:53

I found that "Janus Proxy Configurator" make this crazy behavior. when i disable it, Firefox works well.

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