How can I lock access to Firefox so that only I can fo on the internet and not other users of my computer?

I have a computer which I let several other people use, but I don't want them to have access to the internet. I would like to see if there is a "lock" choice so that no one else can access the internet - or another means? I've tried to select "Lock" to the whole computer (when it gives you the "lock," "shut down," "sleep," etc. choices - and it says the computer is locked but the next time I try it it opens the computer (and internet) just like it never was "locked" so I don't even know how to effectively lock the whole computer either as a second option to block access ot the internet!

I had the same problem (issue with Google Apps and XUL runner etc) of needing to downgrade. To pull it off I went to the main Firefox download page (http://www.mozilla.com/en-US/firefox/new/) and followed the link to OTHER SYSTEMS AND LANGUAGES which took me to a page that included a link on the right hand side to download Firefox 3.6.16.
(The stuff below pertains to Windows. If you are on a different OS your steps will vary)
To do the actual downgrade (and there may be some other steps that would be wise to take but this is what worked for me) I merely renamed "c:\Program Files\Mozilla Firefox" to "c:\Program Files\Mozilla Firefox bad" (in case I want to try troubleshooting the issue later) and then ran the "Firefox Setup 3.6.16.exe" file that downloaded from that link. That solved my problem and I'm back and running 3.6.16.
In case you don't feel comfortable changing things in your Program Files directory you might try a different approach and try uninstalling via the Control Panel and Add and Remove Programs (or whatever it is called on the version of Windows you are on) and then running the installation file. I didn't go that route so I can't tell you how well that might work.

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