Is there a way to block add-ons from being installed in Firefox, even add-ons coming from 3rd party sites?

I work in a small call center and I have been working on trying to convince IT and management to use Firefox on the computers on the call floor. The main issue I have been having in convincing them, is that you can't block add-ons and things like that as easily as in IE. I thought I had it with blocking addons.mozilla.org, which wouldn't allow access to Mozilla's add-on site. However, with that, techs would still be able to go to 3rd party sites, generally the creators of the add-ons, and download them there. Anybody have any ideas on how to stop this?

You can configure Firefox settings to notify you before installing an add-on.
-> click Firefox '''button''' and click '''Options''' (or Tools Menu -> Options)
* '''Security''' panel -> place Checkmark on '''Warn me when websites try to install add-ons''' -> click '''Exceptions''' button -> click '''Remove All Sites''' button and click '''OK'''
* click OK on Options window
Check and tell if its working.

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Is there a way to block add-ons from being installed in Firefox, even add-ons coming from 3rd party sites?

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