Here is a list of the best Google Chrome Search Engine Optimization (SEO) extensions (plugins). Search Engine Optimization (SEO) Extensions Chrome SEO The Google Chrome SEO Extension. Make your SEO tasks easier with Chrome SEO Tools, includes ‘all’ the stats and data you need. Install Extension SEO Status Pagerank/Alexa Toolbar SEO Status is lightweight. It will check the Google Pagerank (PR) & Alexa rank for every page. Using this will increase your Alexa.