after installing the update I get this message on an app from facebook "502 Bad Gateway nginx" what is the issue and what do I need to do to solve the issue?

Hi there, harleygirl. A look around the internet and my previous knowledge indicates this is not an issue with firefox, but with how the server that the app is run on is incorrectly configured. To test this, please install an old version of firefox. You can download an older version from http://www.mozilla.org/en-US/firefox/all-older.html then try to visit the website again. Please let us know if it turns out that it works with version 3.6