[参考链接][https://support.mozilla.org/en-US/kb/how-do-i-use-firefox-spell-checker]
Disabling automatic spell-checking
By default, Firefox is configured to automatically check spelling. You can turn it off in the Preferences window:
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Click the menu button
New Fx Menuand choose Preferences.
Select the Advanced panel.
Click the General tab.
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Uncheck Check my spelling as I type.
Spell Checker Pref 38 Close the about:preferences page. Any changes you've made will automatically be saved.
