Ask HN: What are the best browser extensions for beginners learning to code?

I&#x27;m working on a blog post for our Thinkful students that&#x27;ll include valuable tools and browser plugins for a beginner.<p>Examples:<p>Extensions<p><pre><code> What Font Page Rule Perfect Pixel Eyedropper </code></pre> Sites&#x2F;Apps<p><pre><code> Hipster ipsum Place Kitten Hovt Fake image </code></pre> Intermediate&#x2F;Advanced<p><pre><code> Stylebot Cookie Inspector JSONView </code></pre> What other tools&#x2F;extensions have you found valuable? As you can see, I&#x27;m not looking for text editors or frameworks but fun little hacks&#x2F;tools :) The final post will include a line or two explaining the usecases each app.<p>p.s. do the categories make sense? I was originally thinking of sorting by use case (image editing, copy related, etc).