Fair enough. I guess the surprised reaction you're getting is because web testing frequently involves doing this kind of thing, so, being a community of web programmers, everyone here knows it backwards. I didn't really think of the angle you mentioned where someone wouldn't know all the relevant techniques and just want to get something working ASAP. For that, taking the cookie from FF might indeed be a time saver.

Anyway always good to see everyone chime in with their opinion so thanks for the conversation starter.

BTW, is anyone else nervous about the day the teenage h4xx0rs discover how easy this kind of thing is these days ..