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How do I set user.js for all users?

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I need to set user.js for all users.

For example, I want this line to be there: user_pref("browser.cache.disk.capacity", 4000);

I placed it here: c:\Program Files\Mozilla Firefox\defaults\pref\user.js

But this file doesn't get copied to users profile folders when they run Firefox. Is there any way to set the default preferences for all users rather than copy it to every user profile directory?

Thanks so much for your help, Linda