There is really no universal way to solve this problem at once. First, we have to understand exactly what the problem is with the browser. And to find out, we need to try each of these methods in turn.

Anyway, two reasons are always the culprits for this error. One is a problem with the system itself. It might be an internet glitch or a conflict in the system that has disabled the network functions.

It may also be caused by a hang-up in Mozilla itself. In this case, the system has nothing to do with it and the problem must be solved directly in the browser.

Check Your Network Connection

The first thing to do is to make sure you’re still connected to the Internet. You can use other browsers or apps that can connect to the Internet.

If you’re using Wi-Fi, use another device to check if the network is available there. If you find a connection problem, try reconnecting your device to the access point and restarting the router. This usually helps with network errors.

Firefox connection settings

If you connect to the Internet through a proxy server that is having connection problems, you will not be able to load websites.

To check your connection settings in Firefox:

• Click the menu button and select Settings.
• In the General panel, go down to the Network Settings section.
• In the Network Settings section, click Settings

Change your proxy settings:

• If you don’t connect to the Internet through a proxy (or don’t know whether you connect through a proxy), select No Proxy.
• If you connect to the Internet through a proxy, compare Firefox’s settings to another browser’s.

• Close the Connection Settings dialog.
• Close the about:preferences page. Any changes you’ve made will automatically be saved.

Reboot Mozilla Firefox

If the Firefox Not Loading Pages issue persists, it could come from current preferences of your Firefox. If you want to test this, reset the web browser to default. You can still keep your passwords, cookies, and bookmarks, but open tabs, browser preferences and themes will be reset.

In doing so, Click Firefox, move the mouse cursor over Help and then click Troubleshooting Information. You may then see the Reset Firefox to default, click Reset Firefox.

Mozilla Firefox will then reboot automatically.

Start Troubleshooting in Safe Mode and Disable the Extensions

There is a special safe mode in Firefox that allows you to run your app with Extensions disabled to check if it works. To activate it you need to:

1. Start Mozilla, then click on the button with three horizontal lines at the right top of the screen.
2. In the dropdown menu, select the Help option and then go to the Troubleshoot Mode option.
3. After that, click on the Refresh firefox button.

This is done exactly like the above done steps when rebooting the firefox.

The browser will now boot to Safe Mode. If you can access the websites in this mode, the issue was related to third-party extensions.

So, close Safe Mode and boot to the normal mode. Then go to the about addons page and disable all the extensions.

Turn them on one at a time until you can recreate the issue. When that happens, consider uninstalling that issue-causing addon from the browser right away. Now access the desired page and the issue should have been fixed.

Clear Cookies And Cache

Most bugs on all browsers are caused by errors in temporary files, like Cookies and caches. It’s a good idea to just clear them and see if that helps.

What you will need to do is:

1. Launch Mozilla Firefox on your device
2. Then use the Ctrl + Shift + Del combination to open the Clear Data dialog box.
3. Now, check the Browsing & Download History, Cookies, and Cache options.
4. After that, select Today in the Time range to clear. Then click OK.

This removes the temporary files which may have caused a conflict with the app and prevented you from accessing the internet.

Close the window and go to any web page to see if this method helped you.

Maintain Themes Properly

If firefox themes are not properly maintained, themes can cause issues. If some of them are outdated or incompatible with other themes, Firefox will run slowly or it could experience errors.

Check all of your themes and delete those no longer needed, including the ones that cannot be used or the out-dated ones.

After that, check the remaining themes for available updates. Theme creators don’t always catch up immediately with the firefox updates, thus you must periodically check for any theme updates.

Firefox cannot load certain websites

If you find that Firefox can load some websites but not others, clear your Firefox cookies and cache:

1. Click on the menu button to open the menu panel.
2. Click History and select Clear Recent History….
3. In the Time Range to clear, drop-down then select Everything.
4. Below the drop-down menu, select both Cookies and Cache. Make sure other items you want to keep are not selected.
5. Click OK.

Enabling Hardware Acceleration

If you enable hardware acceleration, Firefox will utilize your graphics processing unit (GPU) instead of your central processing unit (CPU) to help load and render web pages. This enabling of the hardware acceleration speeds up the loading time.

However, if Firefox has problems with your graphics card, this will lead to some issues.

To disable hardware acceleration;

1. Click on the Menu icon (three slashes) on the top right and select Options.
2. In the default General tab of the new screen, scroll down to find Performance.
3. Under the Performance section, uncheck “Use recommended performance settings”.
4. Once you untick the above option, the “Use hardware acceleration when available” option will appear. Just uncheck it too.

After that, restart Firefox and use it normally to find out if this fixes the Firefox Not Loading Pages issue.

Disable DNS Prefetching

Mozilla has a feature called DNS Prefetching. It automatically picks up the resources that your browser can ask for. So, if the browser makes this request, it will already be done and the page will load a few seconds faster.

However, sometimes this technology can cause problems. In some cases, it can crash websites and prevent them from loading.

To disable it you need:

1. Launch Mozilla Firefox and go to its about:config page in the address bar.
   
2. Here you need to click on Accept the Risk and Continue in the popup notification.
3. Then type network.dns.disablePrefetch in the search box and press Enter.
4. Now, click the button situated at the extreme right to change its value from False to True.
   

Now you can try reloading the page and see if you have fixed the bug.

Choose Standard Tracking Protection

The enhanced tracking protection of Firefox brings about three levels of security. These are namely Strict, Custom, and Standard. However, the Strict blocks almost all the page trackers and elements and can also end up harming the loading of websites. So, if your strict mode is enabled then it is best to switch to the standard mode.

1. Open Firefox browser.
2. Go to “about:preferences#privacy” page.
3. Choose Standard Mode. Then click on the Reload All Tabs button.
   
4. When the tabs reload try to access the website you want to verify whether Firefox is loading pages or not.

Disable the IPv6

Firefox supports IPv6 by default, which may cause connection problems on certain systems. To disable IPv6 in Firefox:

1. Type about:config in the address bar and press Enter.
   A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
2. In the Search field, enter network.dns.disableIPv6.
3. In the list of preferences, click the Toggle button next to network.dns.disableIPv6 to set its value to true.

Check for Network Security Software Conflicts

Some Internet security software (antispyware, firewall and antivirus programs) can cause Firefox Not Loading Pages issue. Firefox could crash, could be blocked from launching websites and more.

You can launch the settings of the program, take off Firefox from its list of trusted programs or allowed programs and it will detect it again and then things should start functioning again.

If your program is in the Configure firewalls list so that Firefox can enter the network article, get specific procedures on how to reconfigure it correctly.

Check Your Computer for Malware

Perhaps the problem isn’t with the browser itself, but instead with malware hidden in Windows, causing Firefox to malfunction. Therefore, if tweaking your browser settings hasn’t fixed the issue, running a quick malware scan may help you identify and fix it.

To run a quick malware scan, follow these steps:

1. Open Windows Settings and navigate to Update & Security.
2. Go to Windows Security on the left-sidebar.
3. Click on Virus & threat protection under Protection areas.
4. Navigate to Scan options and choose your preferred scan.
5. Once selected, hit Scan now.

Each scan takes a different amount of time to complete, so wait until the scan is complete and restart your browser.

If you have an antivirus or Internet security program, update its detection database and do a full scan of your system.

Disable the HTTP3

Very few real websites actually care about HTTP3 with almost everyone either still using older standards, or providing a fallback. This means HTTP3 capability is not yet required to browse the modern web.

1. Open a new Firefox window.
2. Type about:config in the URL bar. This will open a settings screen.
3. Search for the setting ‘network.http.http3.enabled’.
   
4. Set this setting to ‘false’ to disable HTTP3.
5. Then, fully close and restart Firefox.

Once the actual software bug has been resolved, go back and re-enable HTTP3 to be able to use HTTP3-dependent services in the future.

Refresh the browser

Instead of grinding for hours to pinpoint the issue and then find the correct fix, just giving your Firefox browser a fresh start could be a game-changer and save you a lot of trouble and time.

Follow the steps below to refresh Firefox:

1. Click on three horizontal lines in the top-right corner and navigate to the Help.
2. From the Firefox help menu, click More troubleshooting information.
3. Click on the Refresh Firefox… button under Give Firefox a tune up.
   
4. In the pop-up window, hit Refresh Firefox.

When you refresh Firefox, all of your extensions will be removed, and any customizations you made will be reverted. Therefore, if you don’t feel comfortable doing this, only close your browser once and reopen it afterward.

Reinstall Firefox

Uninstall the browser and then reinstall it to its latest version, if none of the methods worked. Everything will start from the very beginning and this can fix the issue.

Follow the instructions below:

1. Go to the start menu. Search for Apps and Features
2. Scroll to Mozilla Firefox. Now select the firefox app, and then click on uninstall command
3. When the uninstalling Firefox is complete, open file explorer.
4. Then go to C:\Program Files\Mozilla Firefox
5. Delete all the contents found in that folder

Next, download the latest version of Firefox, launch it and then re-install it again. This will more than likely resolve the issue.

Conclusion

Many users today prefer the Mozilla browser. This browser is quite convenient and fast. It doesn’t have any distracting elements in the interface and it’s quite functional. It’s perfect for everyday users of the internet.

In theory, the fixes in the list should help Firefox get back on track and begin loading files properly. The browser may continue to hang when loading specific pages if they have been added to blocked websites. So, check that as well. Alternatively, if nothing else works, you can switch to another browser.