How to set up Firefox on Windows to ignore registry settings?

It seems that a number of vendors are silently installing Firefox extensions via registry settings. I would like to prevent Firefox from reading any Windows registry settings at start-up.

Does anyone know how to start up Firefox in a way that ignores Windows registry settings?

Is this a problem that Mozilla has solved by changing how Firefox loads extensions and/or uses the Windows registry?

I don't know if there's an elegant solution to this, but you could go to the following keys:

[HKEY_CURRENT_USER\Software\Mozilla]
[HKEY_CURRENT_USER\Software\MozillaPlugins]
[HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla]
[HKEY_LOCAL_MACHINE\SOFTWARE\mozilla.org]
[HKEY_LOCAL_MACHINE\SOFTWARE\MozillaPlugins]

... and simply adjust the Security permissions on them with Everyone - Deny... that would effectively prevent FireFox from reading its own registry settings, and other applications from writing to them, also.

Not sure what effect this would have on firefox's operation, though.

This doesn't directly answer your question, but if your ultimate goal is to prevent Firefox from modifying the registry you might consider running it in a sandbox. Sandboxie can run any application in a sandbox which prevents the program from modifying your registry or file system.

From the Mozilla help forum:

Firefox 3.6+ versions do prevent plugins from being installed to the \Program Files\Firefox\plugins folder to keep plugins out of Firefox, but that isn't how most plugins get "into Firefox". Firefox scans the Windows Registry for plugins that have the correct Registry key for Firefox, and uses those plugins from wherever thay are located on your hard drive. Once the program using that plugin is installed, and the Registry Key is set, all you can do is physically remove the plugin files or turn off the plugin in Tools > Addons > Plugins Sorry, I don't know how plugins are handled in Linux OS's. Impossible to prevent the programs you are installing from installing their plugins for Firefox. Once you give a program permission to install on your PC, it can do anything it wants with Firefox or any other program.