Rated 5 out of 5 stars
This add on is really awesome, and I like the way it works.
Two suggestions though:
First, the ability to add sites to the list manually and permanently pin them. This way I can pin my favorites on install, instead of waiting for them to become frequently used.
Second, in the options there only seems to be a maximum of three rows of thumbnails. My monitor's pretty big, so I'd like to see an option to specify number of rows as well as columns.