I used to be able to right-click on the Quote option on posts and tell it to open in a new tab, and I would get a new tab that was just a message box with the quote in it. The address on the new tab would look like it was pointing to the comment I right-clicked Quote on. Using this box would post to the thread like normal.
Now when I do this I get the new tab with a completely empty box. It still seems to be pointing to the thread and comment, but doesn't actually quote the comment in quote tags like it used to.