Rated 5 out of 5 stars

Hi,
You can easily solve this by editing, in your windows profile, the config.xul on line 63 and add the following:

<menuitem label="6 fps" value="6"/>
<menuitem label="7 fps" value="7"/>
<menuitem label="8 fps" value="8"/>
<menuitem label="9 fps" value="9"/>
<menuitem label="10 fps" value="10"/>

Now, restart Firefox and vwala

This review is for a previous version of the add-on (0.8).