stop using getManifest(), it's deprecated according to addons.mozilla.org's auto-validation
stop using getManifest(), it's deprecated according to addons.mozilla.org's auto-validation

languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon,languagetool-org/languagetool-browser-addon