KGen (Keyword Generator) is an extension that allows you to see what keywords are strong on visited Web page. Than, you can retrieve them for social sharing (tag filling) or webmastering/SEO. KGen retrieves every words of a page and lets you know how many time they appears on her and their weight in the page (a word in the title of a page has a stronger weight than a word in a paragraph).
So, you can easily know how to optimize your pages, know what's the secret of your competitors or simply know what's the main subject of a Web page. You can also select some words and transfer them to your clipboard and paste them on tag fields on your favorite social network or fill meta-keywords of your Web pages.