Rated 4 out of 5 stars
I find that the bottom bar option is the most useful, and in my opinion should be set to default before uploading... either that or the new tab option.
Also, the sidebar option should be deleted. It is too skinny to see anything and you have to keep scrolling to the right more often than when viewing the code in a new tab or on the bottom bar.
This is a great add-on though, and would definitely recommend it to web developers.