How can I disable spell checking in Firefox? This is not a trivial question. The normal option to turn it off does not work. Version is 29.1

Here is a screenshot showing the option turned off yet spell checking is still happening:

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    Are you sure that is a Firefox issue? The same thing happens on Chrome and IE so it might be Google doing spell check on your searches. – user304064 May 28 '14 at 14:09

This is done by Google, not the browser.

As you can see in the image below, if you inspect the code, you can see it uses the class gsc_b

If you remove this class (or overwrite it using GreaseMonkey or similar) the misspelt word is no longer underlined.

enter image description here

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    Thus, a user stylesheet which disables that CSS rule should do the trick, if Google never decides to allow users to turn it off... gist.github.com/sbai/10001777 – alxndr Oct 15 '14 at 21:41

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