Created under the name of “Phoenix” in 2002, Mozilla Firefox is one of the widely used, free and open-source web browsers globally. The open-source feature of Firefox gives developers from all over the world the opportunity to code to the browser and widen the use of Firefox with multiple add-ons and themes. It also offers consumers a feature to privatize their browsing experience with enhanced Tracking Protection.

This feature allows the users not to save any information about the sites and pages they have visited on their computers. With many more brilliant features to its credit, Mozilla Firefox is the ideal browser for many of its users. Through this article today, we would be talking about specific reasons that pull back Firefox from opening in Windows 10. Also, we would be looking at different solutions to solve the issue of Firefox not opening in Windows 10. 

Why Does Firefox not opening in Windows 10?

The reasons why Mozilla Firefox won’t open in Windows 10 are as following:

1. Due to missing or corrupt Firefox files.
2. Difficult add-ons.
3. Corrupted User profile.
4. There’s a problem with some drivers.
5. Your firewall or other security software is blocking or restricting Firefox.

How to Fix Firefox not opening in Windows 10?

Since we now know the potential reasons as to why Mozilla Firefox is not working in Windows 10, we may now look at the solutions to fix this issue:

Solution 1: Restart System to Fix Firefox not opening in Windows 10:

You can restart your Windows 10 system using the following steps:

1. Click the start button on the lower-left corner of the desktop.

2. Click the right arrow next to the shutdown button.

3. Select Restart from the dialogue box that appears.

Solution 2: Restart Firefox to Fix Firefox not opening in Windows 10:

You can find a button to restart Firefox on the profiles page. This page is present on the about section of the browser. Using it, you can restart Firefox following the given steps:

1. Type ‘about:profiles’in the Firefox address bar and then press Enter.

2. Now click the “Restart normally” button to restart Firefox. This will close Firefox and open it again with all running tabs and windows.

Solution 3: Remove or Disable Add-Ons

You can remove or disable the add-ons on Mozilla Firefox using the following steps:

1. Click the menu button and then click Add-ons and Themes.

2. From their select Extensions.

3. Scroll through the list of extensions.

4. Click the three dots on the right for the extension you wish to remove and select Remove.

Solution 4: Delete Firefox Startup Cache

To delete the Firefox Startup Cache, follow the given steps:

1. Open the Firefox browser.

2. Type about:support in the address bar of the browser.

3. You can also click on Help and then go to Troubleshooting information from the menu.

4. On the right, click on the Clear startup cache button.

5. In the following dialogue, click on the Restart button to confirm the operation.

6. The browser will restart. It will rebuild its startup cache.

Solution 5: Check for Malware or Virus

You can perform the Antivirus Scan to check and clean if there is any malware in your Windows 10 system. For example, you can do the Antivirus Scan using the following steps:

1. Click the Start button on the taskbar, type “Security,” and click the “Windows Security” shortcut to open it.

2. To perform the anti-malware scan, click on “Virus & threat protection.”

3. Now finally, click on “Quick Scan” to scan your system for malware. After this, Windows Security will perform a scan and show the results.

Solution 6: Reinstall Firefox

To fix the issue of missing and corrupt Firefox files leading to Firefox not responding in Windows 10 system, try reinstalling Firefox. You can reinstall Firefox using the following steps:

1. Firstly download and then save the installer for the latest authentic version of Firefox from “mozilla.org”

2. Close Firefox.

3. Now note the Mozilla Firefox program folder location by clicking right on the Firefox desktop icon. Then select Properties from the context menu and click the Shortcut tab.

4. Remove and uninstall the Firefox web browser from your computer.

5. Now remove the Firefox program folder by deleting it. The program is usually found in one of the following locations by default:

C:\Program Files\Mozilla Firefox

C:\Program Files (x86)\Mozilla Firefox

5Reinstall Firefox using the installer you had downloaded earlier.

Solution 7: Reset the Firefox web browser

You can reset Firefox using the following steps:

1. Click on the Menu button on the top right of the Firefox browser, and then go to Help.

2. Now click on Troubleshooting Information.

3. Then click on Refresh Firefox when the confirmation window appears.

4. Finally, click on Finish.

Solution 8: Try to open the page in another browser

You can also try opening the page that you want to access in some other browser. If the problem persists, you can follow the rest of the solutions given above in the article.

Frequently Asked Question

Q1. How do I fix Firefox not opening?

Answer: To fix Firefox not opening, try reinstalling Firefox using the following steps:

1. Firstly download and then save the installer for the latest authentic version of Firefox from “mozilla.org”
2. Close Firefox.
3. Now note the Mozilla Firefox program folder location by clicking right on the Firefox desktop icon. Then select Properties from the context menu and click the Shortcut tab.
4. Remove and uninstall Firefox from your system.
5. Delete the Firefox program folder from your system. The program is usually found in one of the following locations by default:

C:\Program Files\Mozilla Firefox

C:\Program Files (x86)\Mozilla Firefox

6. Reinstall Firefox using the installer you downloaded earlier.

Q2. Why is Firefox not opening websites on my computer?

Answer: Try clearing the cache and cookies, and if that does not help, go for an Antivirus Scan in Windows 10 systems using the following steps:

1. Click the Start button on the taskbar, type “Security,” and click the “Windows Security” shortcut to open it.
2. To perform an anti-malware scan, click “Virus & threat protection.”
3. Now finally, click on “Quick Scan” to scan your system for malware. After this, Windows Security will perform a scan and show the results.

Q3. How should I stop Firefox from blocking websites?

Answer: Use the following steps to prevent Firefox from blocking the websites you want to access:

1. Open Firefox.
2. Load the site that you want to disable from Content Blocking.
3. Click the Shield button next to the URL in the address bar.
4. Click on the ‘Turn off Blocking for This Site’ control. Then disable blocking per site in Firefox.

Q4. Why does Firefox not open in Windows 10?

Answer: Firefox browser might not be opening in Windows due to the following reasons:

1. Due to missing or corrupt Firefox files.
2. Difficult add-ons.
3. Corrupted User profile.
4. There’s a problem with some drivers.
5. Your firewall or other security software blocks or restricts Firefox.

Q5. How do I fix an untrusted connection in Firefox?

Answer: You can fix the error of Untrusted Connection in Firefox using an easy method of changing the date and time in Windows following the given steps:

1. Click on the time and date on the taskbar located on the far right and click on the Change date and time settings link.
2. Now, click on the Change date and time button.
3. Ensure that the date and time are correct and click on ok to save and refresh the current page.

Conclusion

We hope that the article has helped solve your issue of the Mozilla Firefox not opening in Windows 10. If you cannot solve the browser problem, you can connect with us via the chat box at the bottom right or through the comment section below. We’ll try to help you solve the issues with your Firefox browser.