While browsing youtube.com, I am getting a regularly reocurring problem. For a while it will work perfectly, but eventually when I click a link to a different video, a window will pop up prompting me to choose between saving or running a file (as if I had downloaded a rar file or something). The file is usually named according to the action I'm doing. For instance if I type in the search bar and hit enter, it might open a file to download or run named "search" (or something similair). With videos the file is named "watch", and occasionally youtube.com's index will even try to save. I have the Downloadhelper addon (quick download of youtube videos and conversion) installed and am wondering if maybe this is causing the problem? Only fix I have been able to find so far is restarting the browser, which is annoying, as I have a tendency to spend hours at a tiem on Youtube. Windows 7 32 bit, E8400, Radeon HD4850, Firefox 3.3.6 (or whatever most recent is). Any help is greatly appreciated.