Rated 4 out of 5 stars

Just installed so can't comment on how effective it is yet, but can already make a few suggestions:
1. I find the frame unnecessarily thick. There should be an option to specify the frame thickness (or even remove the frame).
2. It's confusing that the currently selected tab doesn't show the secuiryt colour, only the other tabs.
3. The tab colours cause tab titles to not be very readable. There should be an option to customize it or set the text colour to something with better contrast. A better option might be to put a coloured frame around the tab rather than fill the whole tab in.
4. I particularly like the idea of highlighting security of submit buttons, but it would be much more useful if it could analyze javascript code to determine where the javascript will send data and if it is secure.

But I do like the general idea behind this extension and with a little tweaking I think it could be one of my new favorites!

This review is for a previous version of the add-on (0.7).