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Firefox is definitely going to have CoffeeScript debugging support in the future, though it's not yet clear exactly what form that'll take.

It's an open, actively-worked-on ticket -- and it's not just CoffeeScript debugging support. It's proper line + column number mapping for anything that compiles to JS.

It'll be a boon for straight-up minified JS as well.

Is this speculation or confirmed?

As Jeremy says, it's an active ticket, and Brendan Eich himself has assured me that he's committed to it.

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