Troubleshoot and Diagnose Mozilla Firefox Issues

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Mozilla Firefox Issues

Most problems with Mozilla Firefox can be resolved by following the methods described hereunder. Try the following steps in their respective order to troubleshoot browser problems. If one troubleshooting step fails to fix the issue, proceed to the next one.

Restart Your PC

Sometimes issues can be fixed by just restarting your system and starting the browser again.

Clear Cookies and Cache

Several problems with loading pages can be fixed by clearing the cookies and cache of Firefox.

  • Open Firefox on your device.

  • Click on the Library button to the right of the address bar, choose History and click Clear Recent History.
  • In the dropdown Time Range to clear, click Everything.
  • Under the drop-down menu, choose Cookies and select Cache.

  • Click on Clear Now.

Restart the Browser in Safe Mode

This refers to a troubleshooting mode, which disables all extensions, disables hardware acceleration, and uses the default Firefox theme, the default controls and toolbar settings, among others. To start the browser in Safe Mode, apply the following.

  • Hold down Shift when opening Firefox, and a dialog box will appear. Just click on the Start in Safe Mode
  • If the issue still happens in this mode, then proceed to the next step. If it does not happen, however, it is probably due to an extension, hardware acceleration or theme.


  1. Steps to Disable Hardware Acceleration

With some graphics driver setups and graphics processors, the browser may crash or may have trouble displaying objects or text on webpages when you use Hardware Acceleration. You can disable the feature to see whether it fixes the issue.

  • Click on the Firefox menu button, and select Options.
  • Type the keyword “Performance” in the Find in Options

  • Under the Performance heading, deselect Use recommended performance settings, and then deselect Use hardware acceleration when available.
  • Then, close Firefox by pressing Alt and F4 keys at the same time, and start the browser again. If the issue is not happening any longer, hardware acceleration was probably the underlying cause. If that is the case, try updating graphics drivers or just run Firefox without hardware acceleration.
  1. Switch to Firefox’s Default Theme

If you are not using the default theme of Firefox, then switch to it. For that, follow the below steps.

  • Open Firefox, and press CtrlShift and A

  • Click on Themes on the left pane, and click to enable the Default
  • Restart Firefox. If the issue does not happen any longer, the non-default theme was causing it.
  1. Disable All Extensions in Firefox

To find out whether a faulty browser extension is causing the issue, disable all installed extensions in Firefox.

  • Click on Extensions just above Themes.
  • Click on the name of a browser extension to choose it.
  • Click on Disable to turn off the selected extension in the list.
  • Repeat this step for each other extension.
  • When you are done, restart the browser.
  • Check if the issue happens with all extensions turned off. If it happens, then one extension is to blame. Enable each extension, and check if the issue persists to narrow down the problem extension. Once you find it out, either disable or uninstall it, and enable the other extensions.

 Reinstall Mozilla Firefox

A problem with a Firefox program file can cause some browser issues. Follow the below steps to fully remove and reinstall Mozilla Firefox. This will not get rid of your Firefox profile information (such as passwords and bookmarks), because that data is stored in another location.

  • Download the installation file for the latest version of Firefox from the Mozilla website.
  • Close Firefox if it is opened.
  • Uninstall the browser from your Windows device. For that, follow these steps.
    • Click on Start and type Uninstall a Program in the search box of the Start
    • Open the Uninstall a Program link from the search results. From the list of programs, choose Firefox and click on the Uninstall Follow the instructions in the Firefox Uninstall wizard to complete the process.
  • Delete the Mozilla Firefox program folder from your system.
  • Install the browser using the setup file you have downloaded before. Just double-click on the installer file and follow the instructions to install it.

Refresh Firefox

This feature can fix several problems by restoring your browser profile to default while saving your important data. To refresh it, just follow the steps mentioned below.

  • Open Firefox, click on the menu button, click Help and choose Troubleshooting Information.

  • In the next page, you can see Refresh Firefox below Give Firefox a tune up. Click Refresh Firefox, and confirm it by clicking on the same button that appears as a dialog.
  • The browser will exit to refresh itself. Once completed, a window will appear listing your imported data. Click on Finish and the browser will open.

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