Simple extension for Mozilla Firefox that calculates grade average and displays it in a readable format.
Head over to releases and download the latest version of Studentweb+.
Then search for about:addons in the search bar. Once there click on the "gear" icon and a dropdown menu should appear. Select the option "Install Add-on From File" and navigate to the location of where the studentwebplus-x.x.x.xpi is located. Select it and click "Open".
Finally click "Add" on the popup that appears.
If the extension appears on the addons page, then you've succesfully installed Studentweb+