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I start using the Web Console that is built-in to Firefox 18.

Do you know any command I can use to disable JavaScript directly from the web console?

PS: Before I was using the addon webdeveloper toolbar where you find such an option, but I would like to be able to switch off JavaScript quickly without addon (and without changing Firefox's settings each time).

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This is one way to disable javascript using the Web Console:

pref set javascript.enabled false

And enable it again:

pref set javascript.enabled true
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Another option for Firefox 25: When opening the web console and clicking the settings icon on the very left there will be a checkbox to "Disable Javascript" (only for the session). – Matheretter Nov 13 '13 at 11:25

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