macosxhints.com – View higher quality videos on YouTube: ”Many people are using a trick to view any YouTube video in high-quality — simply append &fmt=18 to the end of the URL. This is a job for AppleScript! Here are two simple versions; the first, for for OmniWeb: tell application ’OmniWeb’ set current_url to the address of active tab of browser 1 set current_url to current_url & ’&fmt=18’ set the address of active tab of browser 1 to current_url end tell …and the second, for Safari: tell application ’Safari’ set current_url to the URL of current tab of window 1 set current_url to current_url & ’&fmt=18’ set URL of current tab of window 1 to current_url end tell These can be placed in ~/Library » Scripts » Applications » AppName for easy access via the Script menu. [robg adds: Queue user fds suggests that a JavaScript bookmarklet may work better, and it will work in any browser. Create a new bookmark for any site (or a blank bookmark), then change its URL to this: javascript:window.location+=”&fmt=18″;. Choose that bookmark while viewing a YouTube video, and you should get the high quality version.]”