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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
up vote 4 down vote accepted

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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