How to unlock proxy settings in Firefox (fix greyed out)

Can't you edit connection/proxy settings? Can't use VPN connection?
Unlock it

1. Navigate to C:/Program Files/Mozilla Firefox

2. Open mozilla.cfg with Notepad++ and clear everything. Save the file

3. If it ask you to run as Administrator mode, click "Yes" (Note: A password may required)

4. Notepad++ is now launched as an Administrator. Try save the file again

5. Enjoy editing connection/proxy settings!


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