Hi. Thank you very much for your comment and specially for the feedback.

I totally agree with the three changes you mention. Until last year, the extension was shown in a lateral panel that was part of the browser and not inside of the HTML. With the new extensions API and the latest versions of the browsers, I had to refactor it and make it appear in the HTML of the main page. I am not really happy with this change because I don't think that a tool for checking properties of the web pages should modify their HTML.

The good point about it is that, because I am not fully happy with the way in which the results are shown, I will work in an improvement (maybe adding it to the developer tools). The less good point is that I am not sure when it will be ready ;)

So, repeating my first sentence, thank you very much for your feedback ;)