well stuff.
i was playing garry's mod, and was looking for youtube videos to play on a theater and somehow accidentally clicked a link because steam browser is like that. Unknowingly at first, I re-opened it and saw that I had been redirected to some site with the pop-up from the page of like "exczu" or w/e saying "Warning! Your media player is out of date!" or some stuff like that, so I tried all I could to close it out. Eventually being defeated since I realize know how much of a forget I was to not close the game itself, I ended up clicking "Okay" and immediately closed all the browser's tabs. Right before I closed it, however, I saw a download progress by the adobe logo quickly speeding up and it was roughly around the 20% mark when i closed it down
I'm checking my chrome n stuff now and there are no extensions or pop-ups yet, and i'm hoping there was no actual download.
Also, I don't really have any plugins or stuff like that on my steam browser other than flash player or w/e you use to watch youtube videos