Once you're there, the site will check if all your plugins have the latest versions.
If you see plugins in the list that have a yellow Update button or a red Update now button, please update these immediately.
To do so, please click each red or yellow button. Then you should see a site that allows you to download the latest version. Double-click the downloaded file to start the installation and follow the steps mentioned in the installation procedure.
Re: How can I tell if Java is installed/enabled in Firefox browser on my Linux system? I went to Oracle/Java test page and it cannot find Java installed.