Fixes displayname on remote video on FF. Seems innerText is not working on FF, replace it with innerHTML.

modules/UI/side_pannels/contactlist/ContactList.js

 function createDisplayNameParagraph(key, displayName) {
     let p = document.createElement('p');
     if (displayName) {
-        p.innerText = displayName;
+        p.innerHTML = displayName;
     } else if(key) {
         p.setAttribute("data-i18n",key);
-        p.innerText = APP.translation.translateString(key);
+        p.innerHTML = APP.translation.translateString(key);
     }
 
     return p;

modules/UI/videolayout/RemoteVideo.js

         nameSpan.className = 'displayname';
         $('#' + this.videoSpanId)[0].appendChild(nameSpan);
 
-
         if (displayName && displayName.length > 0) {
-            nameSpan.innerText = displayName;
+            nameSpan.innerHTML = displayName;
         }
         else
-            nameSpan.innerText = interfaceConfig.DEFAULT_REMOTE_DISPLAY_NAME;
-
+            nameSpan.innerHTML = interfaceConfig.DEFAULT_REMOTE_DISPLAY_NAME;
         nameSpan.id = this.videoSpanId + '_name';
     }
 };