Here's a list of useful browser extensions that people have found useful and a short description of what they do.
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Loom
With Loom, you can record your screen, voice, and face to create an instantly shareable video in less time than it would take to type an email.
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Web Vitals
Web Vitals are quality signals key to delivering great UX on the web (https://web.dev/vitals). This extension measures the Core Web Vitals, providing instant feedback on loading, interactivity and layout shift metrics. It is consistent with how these metrics are measured by Chrome and reported to other Google tools (e.g. Chrome User Experience Report, Page Speed Insights, Search Console).
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Page Ruler Redux
A Web Developer\Designer ruler to get perfect pixel dimensions and positioning to measure elements on any web page.
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Colour Contrast Checker
Check the contrast between different colour combinations against WCAG standards.
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ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies.
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uBlock Origin
An efficient blocker: easy on memory and CPU footprint, and yet can load and enforce thousands more filters than other popular blockers out there.