Theres a chrome plugin that does something really similar.
This is really handy but theres 1 thing keeping me from using it. The big block of text in the middle of your screen telling which is active. It makes the whole thing useless since I can't see whats on my screen or take screenshots.
You can drag and move it away—plus it stays persistently where you drag it.
Ok that helps but it still gets in the way of quickly taking a look, taking a screenshot and getting back to it.
Im also not sure about the click to remove. If I want to take a look at a flow on our website, I have to activate it each time. That one isnt as big of an issue though because hot keys help.