Software⏱️ 3 min read📅 2026-06-15

How to Fix: Content Security Policy: The page’s settings blocked the loading of a resource at inline (“script-src”) Error on a lot of different websites

Browser extension interference with Content Security Policy.

Quick Answer: Check and disable recently installed browser extensions, especially those related to development tools.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. 💡 Conclusion

The Content Security Policy (CSP) error 'The page’s settings blocked the loading of a resource at inline (“script-src”)' affects users who have enabled strict CSP settings on their browsers, causing issues with loading resources from certain websites. This issue primarily impacts Firefox users who are using extensions that load scripts from external sources.

This error is frustrating because it prevents users from accessing popular websites like GitHub, LinkedIn, and others. The solution involves updating or disabling the problematic extensions and adjusting the CSP settings to allow script loading from specific domains.

⚠️ Common Causes

  • The primary reason for this issue is that some extensions, such as ReactDevTools, ReduxTools, Jetpack, and Keepassxc, load scripts from external sources without specifying a 'script-src' directive in their manifest files. This causes the browser to block the loading of these resources due to the strict CSP settings.
  • Another possible cause is that the user has enabled a restrictive CSP policy that blocks script loading from certain domains or protocols.

🔧 Proven Troubleshooting Steps

Updating or disabling problematic extensions

  1. Step 1: Open the Firefox extensions manager and disable any recently installed extensions, especially those related to development tools.
  2. Step 2: Check the extension's manifest file for a 'script-src' directive and update it to include specific domains that are blocked by the CSP policy.
  3. Step 3: If updating the manifest file is not possible, disable the extension altogether.

Adjusting the CSP settings

  1. Step 1: Open the Firefox settings page and navigate to 'Privacy & Security' > 'Content Settings' > 'CSP'.
  2. Step 2: Click on the 'Manage exceptions' button and add specific domains that are blocked by the CSP policy, such as github.com or linkedin.com.
  3. Step 3: Note: Be cautious when adjusting CSP settings, as it can affect the security of your browsing experience.

💡 Conclusion

To resolve the Content Security Policy error, update or disable problematic extensions, and adjust the CSP settings to allow script loading from specific domains. By following these steps, users should be able to access blocked websites like GitHub and LinkedIn.

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