I have used this addon over the past year nearly on a daily basis due to my work in video production. Not only is it easy to use but it also never failed me.
I have recommended this addon to everyone I know who should know about it but more so, have established it for everyone in our company for over 375 people.
No one has ever had any problem with this addon.
Therefore, I can only recommend the use, the ease of implementation and accurate result delivey for anyone. Ever Firefox user should have it automatically installed.
A big Thank You to the Author.