Heh heh... yeah, a lot of people disagree with me.
Mozilla may keep the text after you click submit if you check the forms box, I haven't tried that. But if you click back and forward again, the text is gone. IE, from what I remember, does keep the text so if you click back a few times to check the original post or others in the thread (opening them in a new window), you can still click forward and the text will still be there.
Point was that it's simple to select the text and copy, getting into the habit as a backup to the technology that should do it automatically. You might say we shouldn't have to take the extra steps; yeah, we shouldn't, but since technology isn't perfect, taking the extra step saves time and headaches when it fails. Like checking to see if a twist-lock biner is really locked- we shouldn't have to take that extra step, the technology should ensure the biner is locked; but I still check it every time because I don't want to trust that technology blindly.