No entiendo como Mozilla permite estas "extensiones" tan cutres.

I use it frequently to check on page SEO factors. I like that it does Accessibility checks (WCAG 2.0 AA) which I have not seen in any other audit tool. It does open a new tab with a report but that is not a bad thing as there are a lot of details. Overall great tool.

The idea is not bad, but nothing really new. I dont like to have a icon "Addon" in my browser who redirect to web sites (services) what needs to analyze a website. That makes no sense for me. I search a long time the tool what exist at Chrome for firefox. It´s called "PageRank Status" and it offers never seen features at almost one view.