How do I prevent changes to the things in "options"? Is there a master password?
My father-in-law has a habit of touching things he shouldn't. I want to lock down FF so he can't change any settings.
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One thing you can do is to give him his own user account (non-administrator) on your computer. Then he will have his own Firefox user profile.
Firefox does have a Master Password feature, but it doesn't "lock preferences" in Options.
https://support.mozilla.org/en-US/kb/use-master-password-protect-stored-logins
You can lock specific prefs with a mozilla.cfg file in the Firefox program folder. This effects all Firefox profile folders that use this Firefox program folder.