Created attachment 8816961 [details] dev tools bug.png User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID: 20161129173726 Steps to reproduce: When open Developer Tools on Separate Window and inspect element on page. When select dom element and back to window page the corresponding dom element selected remain active and is impossible interact with it.
This problem is visible when developer tools windows is open on max screen size. and on Firefox 50
WFM in Fx51b6 on Win10, the selected element be back to normal when I return to the browser window.
Sorry I also am not able to reproduce this problem. Whenever I go back to the browser window, the toolbox in the other window looses focus, and that causes the highlighter to disappear and turn the page back to its normal state. I have tested this in 52 and 53. I'm going to mark this as WORKSFORME. Feel free to re-open if you find more specific steps to reproduce that we can test again.