Spelling & Grammar checker: [LanguageTool](https://addons.mozilla.org/zh-CN/firefox/addon/languagetool/) Translator: [Weel Translate](https://addons.mozilla.org/zh-CN/firefox/addon/weel-translate/) English-Chinese Dictionary: [GoDictionary](https://addons.mozilla.org/zh-CN/firefox/addon/godictionary/)
Spelling & Grammar checker: LanguageTool
Translator: Weel Translate
English-Chinese Dictionary: GoDictionary