FF keeps defaulting to the wrong HTTP proxy server and port. I have to change it every time I attempt to open Firefox? How do I change it for good?

The manual proxy settings keep defaulting to the wrong HTTP and port. This has caused me many hours of anguish. It works fine when I correct the settings but after you log off and then come back it has to be changed again. Is there anyway to fix it? Or can I go back to the previous version because 4 definitely has some issues (other than this one). I could live with it if I had to but I'm not the only one who uses this computer and they don't know how to make the changes. Thanks and I would definitely appreciate an answer.

See:
* http://kb.mozillazine.org/Preferences_not_saved
Start Firefox in [[Safe Mode]] to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
* Don't make any changes on the Safe mode start window.
* https://support.mozilla.com/kb/Safe+Mode
* https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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'''bold text'''

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<blockquote>
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Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")
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Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
# Shockwave Flash 10.0 r42
# Next Generation Java Plug-in 1.6.0_15 for Mozilla browsers
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*http://www.adobe.com/software/flash/about/
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