Firefox Edge Browser Error Code NS_ERROR_NET_TIMEOUT: How to Fix It

Easy 10-30 minutes Medium Severity Verified June 2026
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Error Code
NS_ERROR_NET_TIMEOUT
Brand
Firefox Edge
Product Type
browser
Severity
Medium
DIY Difficulty
Easy
Estimated Fix Time
10-30 minutes
The NS_ERROR_NET_TIMEOUT error in Firefox means the browser attempted to connect to a website but the server or network took too long to respond and the connection was abandoned. This can be caused by a slow or unstable internet connection, a misconfigured network, overly aggressive firewall or antivirus settings, or a problem with the website itself. In most cases this is a software or network configuration issue that you can resolve yourself in just a few minutes.
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Tools You'll Need

How to Fix Error Code NS_ERROR_NET_TIMEOUT

  1. Check Your Internet Connection

  2. Reload the Page and Clear the DNS Cache

  3. Disable Firefox Extensions Temporarily

  4. Change Your DNS Server Settings

  5. Adjust Firefox Network Timeout Settings

    Only modify about:config settings you understand. Changing incorrect values can affect browser stability. Stick to only the settings listed in this step.

  6. Disable Firewall and Antivirus Temporarily

    Do not leave your firewall or antivirus disabled for longer than necessary. Re-enable all security software as soon as your test is complete.

  7. Disable VPN or Proxy Settings

  8. Refresh Firefox to Default Settings

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When to Call a Professional

If you have tried all steps above and the NS_ERROR_NET_TIMEOUT error persists across multiple websites and multiple browsers, the issue may be with your internet service itself. Contact your Internet Service Provider (ISP) to check for outages, line faults, or account issues. If the error only affects specific websites and those sites appear down for other users as well (you can check at downdetector.com), the problem is on the website's server side and there is nothing you can do except wait. For workplace or school networks, contact your IT department as firewall or proxy policies may be blocking the connection.

Frequently Asked Questions

Why does Firefox say NS_ERROR_NET_TIMEOUT but other browsers work fine?
This usually means the issue is specific to Firefox rather than your internet connection. It could be caused by a Firefox extension interfering with connections, a corrupted browser cache, incorrect proxy settings within Firefox, or a modified network timeout value. Try disabling all extensions and clearing your cache first. If other browsers load the site fine, work through Firefox-specific fixes like refreshing the browser to defaults.
Does NS_ERROR_NET_TIMEOUT mean the website is down?
Not necessarily. While a website being offline or overloaded can trigger this error, it is just as often caused by local issues such as your internet connection being slow or unstable, DNS resolution failing, a firewall blocking the request, or Firefox's own settings timing out too quickly. Try visiting the website on a different device or browser. You can also check if a website is down for everyone at downdetector.com or isitdownrightnow.com.
How do I fix NS_ERROR_NET_TIMEOUT on a school or work network?
On managed networks like schools, universities, and workplaces, the NS_ERROR_NET_TIMEOUT error is often caused by a network firewall or proxy server blocking certain websites or slowing traffic. You likely will not be able to fix this yourself. Contact your IT department or network administrator and let them know which specific URL is timing out. They can check firewall rules and proxy configurations to allow access if the site is permitted.
Will increasing Firefox's timeout value fix the NS_ERROR_NET_TIMEOUT error?
It can help if your internet connection is genuinely slow and the server just needs more time to respond. In about:config, increasing 'network.http.connection-timeout' and 'network.http.response.timeout' from the default 90 seconds to 300 seconds gives slower connections more time before Firefox gives up. However, if the website is actually down or your connection is broken entirely, a higher timeout will just make you wait longer before seeing the same error.
Can antivirus software cause the NS_ERROR_NET_TIMEOUT error in Firefox?
Yes. Some antivirus and internet security programs perform deep inspection of HTTPS traffic, which can significantly slow down or block network requests in Firefox specifically. Products that include 'web shields', 'HTTPS scanning', or 'browser protection' features are common culprits. Try temporarily disabling your antivirus real-time protection to test. If the error goes away, look in your antivirus settings for an option to add Firefox as a trusted application or disable HTTPS/SSL scanning for Firefox.

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