The easiest way to do this is to use policies:

https://github.com/mozilla/policy-templates/blob/master/README.md

To allow the domains you need for camera and microphone access.

As far as hiding the popup goes, this article provides updated instructions
to change userChrome.css in the latest version of Firefox

https://support.mozilla.org/en-US/questions/1227376

Mike

On Tue, Dec 11, 2018 at 10:53 AM Baptiste Gavalda <[email protected]>
wrote:

> Hi,
> I represent the company Memo Records. We are using Modzilla Firefox web
> browser to display a local website as an application. We would to avoid any
> outside trouble with any user by being able to modify the browser display.
>
> This application needs to use a camera and a microphone, a each new
> session the browser asks for permission to use the camera and mic. I put in
> options my website as always allow but firefox keeps asking me for
> permission. How can I fix this problem ? Or how can set my website as
> secured only for local purpose in firefox options ?
>
> In the bottom left corner firefox displays the url when I change the page.
> In old version of firefox we were allowed to hide it with the
> user_chrome.css file but it is now not possible. I cruelty have to display
> a mask to hide it. Is there any alternative solution to this ?
>
> Thanks for your help.
>
> Baptiste Gavalda
> [email protected]
>
>
>
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