Style Engine – Custom CSS & JavaScript icon

Style Engine – Custom CSS & JavaScript

by Glitchid

v1.2.0 Updated Mar 6, 2026 95.55KiB
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Description

<p><strong>Style Engine</strong> lets you apply your own CSS and JavaScript rules to websites. Built for developers, designers, and power users who want precise UI control without touching server-side code.</p> <p>Apply custom CSS and JavaScript to websites globally or per domain. Lightweight, local-only, and fully user-controlled.</p> <p><strong>Key features</strong></p> <ul> <li><strong>Global rules:</strong> Apply CSS/JS to all websites (typography tweaks, accessibility improvements, debugging overlays).</li> <li><strong>Per-website rules:</strong> Domain-isolated rule sets with independent enable/disable controls.</li> <li><strong>SPA navigation support:</strong> CSS automatically re-applies on route changes; JavaScript re-run can be enabled in Settings.</li> <li><strong>Optional live preview:</strong> Live JavaScript preview while typing in the popup editor (can be disabled in Settings).</li> <li><strong>Backup &amp; Restore:</strong> Export/import your full configuration safely with a local JSON backup.</li> <li><strong>Flexible feedback:</strong> Desktop notifications, inline feedback, or silent mode.</li> <li><strong>Multi-language interface:</strong> English, Spanish, German, French, Italian, Dutch, Polish, Portuguese, Turkish, and Russian.</li> </ul> <p><strong>Common use cases</strong></p> <ul> <li>Create custom dark mode rules for sites that don’t support it.</li> <li>Hide intrusive UI elements (banners, promos, sticky bars) with a few selectors.</li> <li>Automate repetitive tasks with small JavaScript snippets.</li> <li>Normalize fonts, spacing, and layout for a consistent browsing experience.</li> </ul> <p><strong>Privacy &amp; safety</strong></p> <ul> <li><strong>No tracking:</strong> Style Engine does not collect browsing data or analytics.</li> <li><strong>Local-only:</strong> Your rules are stored locally in your browser.</li> <li><strong>User-controlled:</strong> The extension runs only the code you explicitly write and save.</li> <li><strong>No remote code:</strong> No external scripts are downloaded or executed.</li> </ul> <p><strong>Links</strong></p> <ul> <li><strong>Website:</strong> <a href="https://glitchid.com/products/style-engine/" target="_blank" rel="noreferrer noopener">https://glitchid.com/products/style-engine/</a></li> <li><strong>Documentation:</strong> <a href="https://glitchid.com/products/style-engine/documentation/" target="_blank" rel="noreferrer noopener">https://glitchid.com/products/style-engine/documentation/</a></li> <li><strong>Privacy:</strong> <a href="https://glitchid.com/privacy/style-engine-privacy/" target="_blank" rel="noreferrer noopener">https://glitchid.com/privacy/style-engine-privacy/</a></li> <li><strong>Terms:</strong> <a href="https://glitchid.com/terms/style-engine-terms/" target="_blank" rel="noreferrer noopener">https://glitchid.com/terms/style-engine-terms/</a></li> <li><strong>Support:</strong> <a href="mailto:support@glitchid.com">support@glitchid.com</a></li> </ul> <p><strong>Publisher:</strong> <strong>Glitchid</strong></p>
Style Engine – Custom CSS & JavaScript screenshot 1

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Permissions (4)

Permissions

activeTab Can access the current tab when you click the extension notifications Can show desktop notifications scripting Can inject scripts into web pages storage Can store data locally in your browser

Details

Version 1.2.0
Updated Mar 6, 2026
Size 95.55KiB
First Seen Mar 31, 2026