Firefox is still one of the best browsers out there, that’s available on both computers and mobile devices. Unfortunately, this application comes with some bugs and issues, which can be quite annoying sometimes.

If you are using Firefox on your computer, then you probably have noticed that sometimes the browser stops responding to clicks and keystrokes. The “Not Responding” label will also be displayed in the title bar and the mouse cursor will become a spinning wheel when it’s over the Firefox window.

If you are tired of this issue, then you’ve come to the right place, as today we will talk about how you can stop or, at least, reduce this problem.

Turning Off Hardware Acceleration

Not many know, but your graphics card or the graphics driver setup may cause the Firefox to stop responding. This happens when Firefox is trying to use the hardware acceleration. This is the reason why we suggest you to turn off hardware acceleration and see if that fixes your problem.

  • Click the menu button located in the top-right window of Firefox;
  • Select “General” panel;
  • Look for Performance and under it make sure that the “Use recommended performance settings” is unchecked;
  • Once you do that, an “Use hardware acceleration when available” option will appear, which you will also need to uncheck;
  • Restart Firefox.

In case this fixes the problem, then it was the hardware acceleration that was causing the browser to stop responding. You can also try to upgrade the graphics drivers to see if that fixes the issue or just simply run Firefox without the hardware acceleration option.

Deleting Duplicated Session Restore Files

Multiple copies of Session Restore file might cause the Firefox to stop responding. To fix this problem, take the following steps:

  • Click the menu button located in the top-right window of Firefox;
  • Click the “?” button and select Troubleshooting Information;
  • A new tab will open, where you will have to click on the “Open Folder” button located under the “Application Basic” section;
  • A folder with your profile files will open;
  • Close your Firefox browser;
  • Locate and delete the sessionstore.js file and any copies such as: sessionstore-1.js, sessionstore-2.js.

After that you can launch Firefox and see if this has fixed your problem.

Changing The “PAC” Implementation

If you are using a proxy auto-config file (also known as PAC), then there are high chances that Firefox will stop responding while websites are loading for the first time (or while accessing websites that you’ve not visited recently). To check if you are using an automatic proxy configuration file, take the following steps:

  • Click the menu button located in the top-right window of Firefox;
  • Click the “Options” button;
  • Select Advanced Panel->Network;
  • Click Settings (this will open the “Connection Settings” dialog);
  • In case “Automatic proxy configuration URL” is selected, you are using an automatic proxy configuration file.

We suggest you to NOT disable this setting, as it will prevent you from accessing the internet. Instead, you will have to talk with to your network administrator about your problem and suggest him to take a look at this Mozilla Firefox web page. We agree that this doesn’t entirely fix the problem, but users have reported that it is way better than before.


We agree that Firefox still has many issues, but we assure you that the developers are continuously working on it. There are already reports saying that the new Firefox 64-bit version is fixing most of the issues that the users with powerful computers had before.

Are you using Firefox on your computer? Tell us your thoughts about it!

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