The Expand option does not always work! Puntuado con 5 de 5 estrellas

There is definitely a problem with the Expand option. I use Windows 7 Ultimate.

First, I selected High Resolution and Expand as my two option choices.

Two times so far, at two different days, I clearly noticed when I checked a video on youtube.com that the Expand option was not applied.
Once I have selected the Expand option on a particular video where the Expand option was not applied, it works fine for the entire time I use my computer for that particular session. So, for instance, I could close fully my Firefox 9.0 and restart Firefox and I still would have the Expand option working.

Apart from this bug (I assume), this add-on is perfect to me.

Thanks a lot for the developer.

Esta valoración es de una versión anterior del complemento (1.0.1-signed). 

Cookies

Thanks for the review,

Size changes depends on the Youtube cookies. If you do not let Youtube cookies or having problems about generic Youtube cookies things might behave strangely. Normally add-on works without any problem. If you still having problems please pay attention for cookies in your Firefox. You may want to disable the add-ons that prevent the cookies.