Extension wouldn't show an extension button to click. *EDIT* It does work. The "extension button" is in the address bar and not where all of my other extension buttons are. I suggest you clarify you "about" instructions to state where the button is.

installed the Add-On, logged into my T-Mobile, and boom got the SOC code right away. Could not have made it easier than clicking the T-Mobile icon in the address bar, thanks for a simple and functioning Add-On!

Worked as detailed, made finding the SOC really easy, thanks!