--- title: "How do you fix the error \"Firefox is already running but not responding\"?" description: "How do you fix the error \"Firefox is already running but not responding\"?" author: "Lily Chitlangiya" published: 2022-02-11 canonical: https://answers.mindstick.com/qa/95719/how-do-you-fix-the-error-firefox-is-already-running-but-not-responding category: "troubleshooting" tags: ["firefox", "mozilla firefox", "not responding", "troubleshooting"] reading_time: 3 minutes --- # How do you fix the error "Firefox is already running but not responding"? How do you [fix the error](https://answers.mindstick.com/qa/94672/how-do-i-fix-the-error-something-went-wrong-please-try-again-in-google-assistant) 'Firefox is [already](https://yourviews.mindstick.com/view/82706/have-you-already-had-a-breakthrough-covid-infection) running but not responding'? \ ## Answers ### Answer by user Steps to [fix](https://yourviews.mindstick.com/view/81628/how-to-fix-your-broken-heart-try-out-these-ways-for-sure) the [error](https://www.mindstick.com/forum/459/iis-7-error-503-service-unavailable) 'Firefox is already running but not responding': - **Firefox's Clear Browsing History-**Open Firefox and go to the top-right corner of the browser and click the three lines button.Then select **Options -> Privacy & Security** from the drop-down menu. Scroll down to History in the right pane and click Clear browsing data.Choose a time range, such as All Time, and check all of the boxes under Browsing history. To remove all browsing history on Fire, click the Clear Now button. - **Date and time should be corrected.-**Many websites make use of security certificates, which have an expiration date. If your PC's date and time are incorrect, your browser may detect that the certificate is out of date and display the notice 'Your connection is not safe' in Firefox.You may adjust the date and time by right-clicking the Date and Time symbol in the bottom-right corner of your computer screen and selecting Adjust date/time. - **Check for malware and temporarily disable anti-virus software.-**Malware or antivirus software can sometimes interfere with your Internet connection, resulting in the Firefox your connection is not secure error. Using Windows Defender or third-party security software, run a malware scan to eradicate malware. - **To fix Firefox, restart your router. Your Internet Connection Isn't Safe-**Then uncheck the box that says 'Set time automatically.' Turn this option back on after a while.You can also manually alter the time and date by clicking the Change button.To turn off your router and modem, push the power button on the router and modem. To turn on the router/modern, click the power button again after around 1 minute. Then reopen Firefox and visit the target websites to see if the 'Your connection is not secure' issue remains. \ \ Read More \ ### Answer by Hitesh Vohra - Firefox users have been plagued by the problem '**[Firefox](https://answers.mindstick.com/qa/95585/what-are-the-pros-and-cons-of-using-mozilla-firefox) is already operating but not responding.**' When you get this issue, you don't need to restart your computer; you can generally fix it by immediately heading to Task Manager. - The nuclear option is to **restart your computer**, which, frankly, isn't a good idea. You can still fix this error without restarting your computer if you encounter it. - If you've tried everything above, including restarting your computer, and you're still getting this message, it's possible that your Firefox profile is 'locked.' - Firefox is designed to ensure that a profile is only used by one copy of Firefox at a time. Special lock files are placed in the profile directory to ensure this. When Firefox crashes or closes abruptly, it may leave the file locked in unusual instances. \ **Read More: [What are AdSense issues?](https://answers.mindstick.com/qa/95729/what-are-adsense-issues)** --- Original Source: https://answers.mindstick.com/qa/95719/how-do-you-fix-the-error-firefox-is-already-running-but-not-responding Copyright © MindStick Software Pvt. Ltd. This Markdown version is provided for developers, AI systems, and offline reading.