[CarbonJ]

What would you like to see from Firefox to make it more headless and scriptable? Are there specific usecases you're interested in supporting?

[slau]

I'd love to be able to modify JS at runtime on random websites. Too often there's a bug, or a "feature" that prevents me from using a service, that I could fix by removing an event or something in the JS code.

[holowoodman]

That's what development tools are for. Or Greasemonkey/Violentmonkey.