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can i get startup master?

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I want to be able to keep my son from using firefox without the parent sign in in for him. Youtube tells me that I could use startup master to set it up so every time he tries to open firefox it will ask for a password. I went to add-ons in firefox but it does not exist anymore. Is there another way to perform the same task without startup master.

I want to be able to keep my son from using firefox without the parent sign in in for him. Youtube tells me that I could use startup master to set it up so every time he tries to open firefox it will ask for a password. I went to add-ons in firefox but it does not exist anymore. Is there another way to perform the same task without startup master.

Modified by tela2018

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Older extensions for Firefox 1-56 needed to be rewritten for Firefox 57+. so older recommendations may be obsolete.

You could search for something new on the Add-ons site; I didn't see anything in my first few minutes.

https://addons.mozilla.org/firefox/

You may need to consider software that runs at the system level to deny network access to all programs until permission is given.