SEO Toggle - An SEO Testing Extension

About

SEO Toggle is a powerful SEO Chrome Extension that puts essential SEO testing tools right at your fingertips.

Whether you’re diagnosing crawl issues, checking how your content appears without JavaScript, or auditing for mobile-first indexing, SEO Toggle makes the process faster, easier, and more reliable.

// Features //

✅ One-click toggles to disable JavaScript, CSS, Images, and Cookies.
✅ User-Agent switching to view your site as Googlebot, Bingbot, and more.
✅ Mobile device emulation to audit for mobile-first indexing.
✅ Network throttling simulation for real-world speed testing.
✅ Fast, lightweight, and built for SEO professionals.
✅ Automatic settings save for seamless ongoing testing.

// Why SEO Toggle? //

A key part of SEO is ensuring that search engines can find and access your critical content — ideally, without relying on JavaScript.

SEO Toggle allows you to quickly test how your website behaves when key resources like JS, CSS, Images, and Cookies are disabled, helping you identify content that remains easily accessible to crawlers.

It’s also common for more complex websites to serve different content based on user-agent detection (for example, serving one version to Googlebot and another to regular users).
With SEO Toggle’s user-agent simulation, you can easily spot any differences and ensure your site complies with SEO best practices.

With Google now operating a mobile-first index, SEO Toggle makes it simple to simulate a mobile crawler’s experience. Combine device emulation, custom user-agents, and resource blocking to fully audit your site in the same way a search engine would.

// Permissions //

** storage **
- Purpose: To save your extension settings locally on your computer.
- Why it's needed: This allows the extension to remember which features you've turned on or off (like disabling CSS or enabling mobile view) even after you close and reopen your browser.

** scripting **
- Purpose: To modify the web pages you visit.
- Why it's needed: This is essential for features like: Disabling CSS styles directly on the page.

** debugger **
- Purpose: To control certain browser features normally accessed through developer tools.
- Why it's needed: This permission is required for advanced testing features like: Simulating different mobile devices (Mobile View).  Changing your browser's reported identity (User Agent simulation, e.g., pretending to be Googlebot). Simulating different internet connection speeds (Network Throttling).

** declarativeNetRequest **
- Purpose: To block specific parts of websites from loading efficiently.
- Why it's needed: This is used to: Block JavaScript files from running. Block external CSS stylesheets from loading. Prevent cookies from being sent or received. This method is faster and respects user privacy more than older methods.

** contentSettings **
- Purpose: To change browser settings for specific types of content.
- Why it's needed: This is specifically used to turn off image loading across all websites when you use the "Disable Images" toggle.

** host_permissions: ["<all_urls>"] **
- Purpose: To allow the extension to work on any website you visit.
- Why it's needed: Since this is a general-purpose testing tool, it needs permission to interact with any website you might want to test. This allows all the features mentioned above (like disabling CSS, blocking JS, simulating mobile devices) to function correctly on the specific page you are currently viewing.