Firefox add-ons

The two Firefox Add-ons that I have experienced are called Firefox personas and the extensions you can add to firefox. Personas let you change the background look to your web browser on firefox, it has a list you could choose from or you could find a background that you want by searching for it in the search bar in the top right corner. One of the personas I have added is one of the most popular ones added called blue firefox, The picture below shows you what it looks like.

And one of the extensions I have found on firefox is called play your piano, once you add it to firefox you can press random keys to play different sounds in the piano as you go along.