What values are returned for navigator.appName values for all common browsers?
The navigator.appName value for Firefox is Netscape.
What values are returned for IE, Firefox, Google Chrome, Safari, Opera, Flock, etc.?
If you trust the user agent, you can use this web site: http://www.useragentstring.com/
It provides an API to analyse your current browser. It also has data on about every user agent you can imagine.