'm using firefox version 4 in my network and i want the clients can't change my network proxy that we are using i did it in previous version but it doesn't work in version 4, so how can i do it?

''locking as a duplicate of this thread - https://support.mozilla.com/en-US/questions/827625''
I've network in my company and installing internal web proxy that allow clients to connect to the internet (ISA 2004). I'm using the Firefox as default browser in my network. so what i need that no one in my network clients can't change the proxy settings or it just be dimmed. i did it in the previous version but when i try the steps in version 4 it doesn't work so I'm asking for solution for that.
many thanks for help,
Ahmed Khairy

Leliforever, cheek you list of installed add-ons, the Ask toolbar can be installed without the users knowledge.
For checking other extensions that may cause this, follow the procedure in this link - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

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