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How to disable "Check Spelling" forever?

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I absolutely hate it. It reappears each time I load a page with text box. Please fix it. I never want spell checking, since it thinks special use words are a misspelling.

Chosen solution

Hello! If you either (1) click the three-bar menu on the top right --> options --> advanced or paste "about:preferences#advanced" into your browser for Firefox.

You can disable "check for spelling as you type"

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All Replies (5)

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And stupidly, you can't delete words from dictionary. What a devil.

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Chosen Solution

Hello! If you either (1) click the three-bar menu on the top right --> options --> advanced or paste "about:preferences#advanced" into your browser for Firefox.

You can disable "check for spelling as you type"

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You can always add those words to the spell checker.

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FredMcD said

You can always add those words to the spell checker.

This doesn't work because dictionary is only finite and there are building number of words I use. However, disabling it "as I type" worked.