Hey gargamel,
I think you'll find that Flock 1.0 truly integrates all our advanced features in a way Firefox extensions can't. You can drag and drop across features: photos and videos from our Mediabar to our People sidebar, articles from our feed reader to our blog editor, etc. Our features know when you have activated a service in Flock and make it available across our various features, rather than requiring specialized setup for each. And, significantly, Flock keeps these features from clashing with each other and fighting for performance: it's all optimized to work together. Additionally, many Firefox extensions actually work in Flock if you're looking for additional features.
Give it a chance, you might like it!
Evan Hamilton
Flock Community Ambassador
evan at flock dot com