Okay, so I was here on GOG a little while ago and posted something, but then I moved on to one of my other online haunts, browsed there for a while, then moved on to another forum. While on that forum, I was typing a response to someone and accidentally "fat fingered" some odd key combo which caused a new Firefox window to open up. I was shocked to see that it was the reply window from GOG for the last topic I posted in before I left the site. On top of that, it still had everything I had typed before I clicked the post button. I don't know how I did it, but it is something I would definitely like to be able to do on purpose when needed. Anybody have any idea what Firefox key combo could do something like that?

Nope, that was the first thing I thought of; I checked the thread to make sure I didn't just neglect to click the post button and confirmed that my reply had already been posted and it's content matched exactly what was in the "new" reply window. I really don't see how I could have accidentally typed the same exact thing in two different reply windows, only submitted one of them and not noticed it before hitting that key combo. This wasn't a simple one or two word reply; like my usual wordy posts, it was bullet-pointed paragraph with links to references. I could not possibly have done it twice without realizing it.
That was it! Thanks!