NOTE:
The first time you try to install WSO2 Tungsten XPI you will be prompted to allow or block this page. i.e: Firefox browser will display a bar on the top of the browser with a warning message. To continue with the installation, follow these steps.
Click "Edit Options..." button on the right hand side of the warning message bar.
Then it pops up a dialog box with a set of allowed sites and asks whether to add the address of the site hosting the XPI to the allowed list.
Click "Allow" button next to the address. Then click "OK" to close the dialog box.
Click the install Tungsten.xpi link again and the xpi will be installed in your browser.
Restart the browser (You should close all the Firefox browser windows open) and WSO2 Tungsten XPI is now ready to use!..