PeekCSS by Leon Grass

Inspect CSS, colors, fonts, and assets on any webpage.

Some features may require payment

5 (3 reviews)

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About this extension

PeekCSS is a Firefox-native CSS inspector — hover any element to read its
computed styles instantly, no DevTools required.

Free, no account needed: hover + click inspection, grouped CSS with
copy, contrast ratio badges (AA/AAA), and basic color/font info.

Free account unlocks: full page color palette, complete fonts panel,
and accessibility scoring.

Pro adds palette export (CSS/SCSS/JSON/Tailwind), font pairing
suggestions, asset downloads with "download all" ZIP, and inspection
history.

Privacy-first: nothing about the pages you inspect ever leaves your
device. The only network call is an optional license check if you've
purchased Pro.

Rated 5 by 3 reviewers

PeekCSS by Leon Grass

Required permissions:

Optional permissions:

Data collection:

Optional data collection, according to the developer: