Basically, questions like "I'm a user, I'm having trouble with website X, and I think it's them, not me." I'm experiencing what seems like a bug in a text field in Amazon.com, and Super User kicked out my question as being "off-topic".
If your question generally covers …
- Using Gmail, Facebook, Twitter, Google, or any other website which behaves like an application
- Features of browsers which are directly related to the use of a web application (Greasemonkey scripts for a web application, etc.)
… then you’re in the right place to ask your question!