The Download Now link will prompt a local download of the Firefox extension. To install the extension directly, open the file using your Firefox browser.
Correct 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/).