The selector is so good.

Unfortunately, it doesn't seem to copy anything into clipboard. Please check.

Example:. Ctrl and then a mouseover over GitHub > In Browser Console (Ctrl+Shift+J) it shows an error from content.js, line 287:
Content-Security-Policy: The page’s settings blocked an event handler (script-src-attr) from being executed because it violates the following directive: “script-src
That is in unction highlightActiveElement(newActiveElement, x, y) >>> line:
extensionDiv.innerHTML = string;

Could you also add it to GitHub, please?