Futon doesn't work with Firefox 4.0b9?

[Dirkjan Ochtman]

It looks like Futon (in 1.0.1) doesn't work with the latest Firefox
beta. I get this error:

Error: JSON.parse
          return JSON.parse(window.name || "{}")[name]; (line 369 in futon.js)

window.name seems to evaluate to Evaluator, which JSON.parse might not like?

Cheers,

Dirkjan