Could you be more specific?
Might just be talking about illegally downloading movies through bittorrent or something like that (which you generally need a browser to download the target file).
Doubtfully, but just as cool is an app called TubeTV. It's a free download for Mac (requires a plugin Symbian to be downloaded as well, it tells you all about it) that can be used to capture a page from your web browser and download embedded video clips through the likes of livetv or youtube and automatically convert them to a iPod or iPhone ratios. However, I don't think it works just yet with youtube's new widescreen format. An update will hopefully follow.