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doesn't work with Fx 4.0b4pre.

Error: MSG_ALERT is not defined
Source file: chrome://venkman/content/venkman-utils.js
Line: 286
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Error: console.commandManager is undefined
Source file: chrome://venkman/content/venkman-static.js
Line: 281

Это отзыв для предыдущей версии этого дополнения (0.9.88). 

Oops! Yes, you're right. I've fixed the problem, the fix is in 0.9.88.1, which will hopefully be approved by AMO soon. Thanks for pointing this out!