CSS Injector Persistent
Add your own CSS to any website. Styles are saved per domain, re-applied on every visit and can be toggled on or off. Private: no data collection, and pages can't read or detect your styles.
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• Pin the CSS Injector icon to the toolbar (puzzle menu 🧩) to see the ON badge when custom CSS is active.
• If a site's styles override yours, add !important to your rules.
• Firefox doesn't allow extensions on internal pages (about:*), addons.mozilla.org or the PDF viewer.
• Found a bug or have an idea? Open an issue: https://github.com/bosspetta/css-Injector/issues