Developer's DescriptionBy Tochika KounenCorrect spelling mistakes and grammar errors on texts to enhance your learning skills.TwinMarker is a Free Online Grammar Checker for English language learners. The add-on adds the data import and export features to the generic version. This add-on allows you to copy the text from the focused area on a web-page and write it back to the source page. The grammar checking is performed on the server-side (http://twinmarker.net/).