Install Chartlet extension

Click on this link

Please note that you may have to allow popups from www.chartlet.net for the installation to be possible.

Once the installation is finished, you must restart Firefox to be able to use the extension.

After restart, you should see the Charlet icon in your toolbar.

If the icon does not appear in the toolbar, go to menu View/Toolbar/Customize and drag the Chartlet icon to the toolbar.

Alternatively, you can install the extension from addons.mozilla.org servers at https://addons.mozilla.org/en-US/firefox/addon/4906 .