Great add-on, GREATEST developer. Rated 5 out of 5 stars
Left a review saying that it wasn't working for me, got precisely the reply I needed ("Turn it on." Boy, I feel silly now.) Now that's service!
Rated 4 out of 5 stars
No longer working for me in the UK as of 22 Dec 2011 - the US video sites I use this for are giving me the 'Not available in your area' error. Love this add-on, hope it can be fixed!
Open the main Modify Headers window and click 'Start' so the icon turns from grey to red.