Updated: As the developer stated - it does not work on Mozilla sites which I initially tested it on by trying to translate the non-English reviews here. But it works fine on other sites by selecting text and clicking the addon button

Please consider adding a context menu item for 5 stars as I don't like many buttons on the toolbar. After selecting text, my instinct is to right-click the selection rather than go up to the addon button on the toolbar. Thanks. :)