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SEOquake is a free plugin that provides you with 'key' SEO metrics, along with other useful tools such as SEO Audit and many others

Makes JSON easy to read. Open source.

Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies

Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.

Clear your cache and browsing data with a single click of a button.

Spoofs & Mimics User-Agent strings.

Capture a screenshot of your current page in entirety and reliably—without requesting any extra permissions!

Simple yet powerful Cookie Editor that allow you to quickly create, edit and delete cookies without leaving your tab.

Instant website analysis, including site rank, site traffic, sources and geography.

The Tag Assistant Companion extension works with Tag Assistant to help troubleshoot installation of gtag.js and Google Tag Manager.