This is something I thought Mozilla would eventually fix, but still hasn't in over a decade.

When clicking a target="_blank" link that opens in a new tab, the URL bar shows "about:blank" until the server responds.

Also, document.location.href in the console returns "about:blank" instead of the real URL. This is annoying for user scripts.

It would be better if it immediately showed the target URL. document.location.href also should immediately return the correct URL.