LanguageTool - Online Grammar, Style & Spell Checker
LanguageTool is a free online proofreading service for English, German, Spanish, French, and more than 20 other languages.

The extension is not libre, though.

They have an older extension here that is free, but it hasn’t been updated since 2018.

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All about open source! Feel free to ask questions, and share news, and interesting stuff!

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