Nice ... But ... Rated 4 out of 5 stars

About 1080p option, could you use the cache of FF after I played the video at 1080p ? thanks for this addon =)

(Edit) ... Hi again, really the version 7.1 works fine, thanks for the explanation and spending time answer me. Continue the great job =)

This review is for a previous version of the add-on (7.10.1-signed). 

Not possible

Read this - http://youtube-downloader.uservoice.com/knowledgebase/articles/269295 why this is not possible.