Download
Get PeekCSS for Firefox
Free to install, no account required. Chrome support is on the way.
Firefox-first by design. Chrome (via the sidePanel API) is a planned future target.
screenshot: add-on listing / install (install.png)
Up and running in four steps
1
Add to Firefox
Install from Mozilla Add-ons — one click, no account needed.
2
Pin the sidebar
Open the PeekCSS sidebar and pin it. That’s your inspector home base.
3
Hover & click
Press W to start inspecting. Hover to highlight, click to load the CSS.
4
Unlock Pro (optional)
Bought a plan? Paste your license token in Settings to unlock everything.