This is our old add-on. We recommend using the new one instead (completely rewritten and under a new license):
- Firefox: https://addons.mozilla.org/firefox/addon/languagetool/
- Chrome: https://chrome.google.com/webstore/detail/languagetool/oldceeleldhonbafppcapldpdifcinji
- Opera: https://addons.opera.com/extensions/details/grammar-and-spell-checker-languagetool/
- Edge: https://microsoftedge.microsoft.com/addons/detail/grammar-and-spell-checker/hfjadhjooeceemgojogkhlppanjkbobc