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Ginger for Firefox is a handy and reliable browser extension designed to check grammar and spelling while you're typing.
Whenever a word is misspelled, the addon underlines it and offers you suggestions for your text. This is a restartless extension, which means you won't be required to restart the browser in order to enjoy its functionality.
Requirements:
· Firefox 14.0 and later

Via: Ginger for Firefox 1.1.1.1