Bug 1564588 - No longer persist third-party permission. r=johannh

Differential Revision: https://phabricator.services.mozilla.com/D40897

--HG--
extra : moz-landing-system : lando

browser/modules/webrtcUI.jsm

@@ -639,6 +639,10 @@ function prompt(aBrowser, aRequest) {
         if (videoDevices.length && sharingScreen) {
           camAllowed = false;
         }
+        if (aRequest.isThirdPartyOrigin) {
+          camAllowed = false;
+          micAllowed = false;
+        }
 
         let activeCamera;
         let activeMic;
@@ -1082,8 +1086,11 @@ function prompt(aBrowser, aRequest) {
     },
   };
 
-  // Don't offer "always remember" action in PB mode.
-  if (!PrivateBrowsingUtils.isBrowserPrivate(aBrowser)) {
+  // Don't offer "always remember" action in PB mode or from third party
+  if (
+    !PrivateBrowsingUtils.isBrowserPrivate(aBrowser) &&
+    !aRequest.isThirdPartyOrigin
+  ) {
     // Disable the permanent 'Allow' action if the connection isn't secure, or for
     // screen/audio sharing (because we can't guess which window the user wants to
     // share without prompting).