It works Rated 3 out of 5 stars

This add on appears to work on popular websites, however it didn't work for me on specific sites.

(The tools add on bar is what you need to see the red disk icon.)

This review is for a previous version of the add-on (0.4.1-signed). 

Would you please share one of the websites that the addon did not work. Remember that the addon does not work on websites that requires login information such as social networks, bank accounts, etc.
Thanks for your feedback.