It currently seems impossible to add Google Chrome as an external web browser in Flash Builder Standalone for Mac. In this context, Eclipse only cares about \"Unix executabl
You can do this from the UI in FB 4.5 - However, you need this exact path (unquoted and unescaped) in Preferences->Web Browser. Select "Use External Browser" and add the line below as the location (You may not need the 'name\="Google Chrome" bit, but looks like it worked all in one line for me):
/Applications/Google Chrome.app/Contents/MacOS/Google Chrome" name\="Google Chrome