If you've just created your account or clicked on the “Download Dympol” button, your download has already begun. Just follow the on-screen instructions below.
First, you probably see a message like the one pictured above. Don't sweat it. By default Firefox only lets you download add-ons from their own site. All you have to do is click Allow in the yellow message bar.
Next, the Software Installation window will display (as shown above). Just click the Install Now button.
When prompted (as shown above), click the Restart Firefox button to complete the installation.
See you in a minute! : )