This addon does not work. Don't waste your time on it. Even if the author of the addon makes it compatible for the current version of Mozilla Firefox browser, the developers of Mozilla will "upgrade" their browser to another version higher and the addon will stop working again. Guaranteed. It's a constant race between No Squint developer and Mozilla developers to see who can make the life of the browser's users more miserable. Both strive to win the title "The Worst Product of the Year".