This page contains a JavaScript and AJAX code for accessing web application that performs the required tasks for login into LinkedIn. Once page is loaded a procedure for granting access is start. When ready, you will see the test button become enabled, that will let you perform a sample command.

Note that current implementation detect by Cookie if access was granted prior to starting authorization process. If access was granted already in the active browser's session, process will skip directly to the phase of executing commands.
It means that if you just refresh the browser, the process will not restarted. you need to close the browser in order to see the process again, Or click the "Restart" button. You can change this behaviour in the script.