Solutions to fix it Firefox Hangs

 Firefox hangs after using it for a long time

Update Firefox

The latest Firefox versions includes improvements in memory usage, especially during long sessions.

Restart Firefox

Firefox may hang if left open for long periods of time. To fix the issue, restart Firefox.

If you regularly leave Firefox open so that you return to where you left off, you may want to use Firefox's Session Restore feature.

Firefox hangs when downloading files or saving images

If Firefox hangs when you attempt to download a file or save an image, try these solutions:

Clear download history

Firefox may hang when downloading files if your download history has grown too large. To clear the download history:

1. Click the Downloads button  on the toolbar, if it's available, or else click the Library  button and click Downloads from the menu.
2. Click Show All Downloads at the bottom of the Downloads panel. The Library window will open.
3. Click the Clear Downloads button at the top of the Library window.
4. Download some sample files to see if the hanging has stopped.

Choose a different download folder

Firefox may hang if the last download folder location (e.g. a shared volume or USB drive) is no longer available. To fix this:

1. Click the menu button  and select Options.
2. Select the General panel.
3. Under Downloads, select Save files to and click the Browse button.
4. In the Choose Download Folder window, choose a new folder location.
5. Close the about:preferences page. Any changes you've made will automatically be saved.

See if you are now able to download files or save images. If this works, you can go back to your Firefox settings, if you wish, and select Always ask me where to save my files.

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How to fix firefox is not responding?

Some steps to fix firefox is not responding:

Delete duplicated Session Restore files

Firefox may be slow to respond or hang if multiple copies of its Session Restore file have been created:

1. Open your profile folder:Click the menu button  , click Help and select Troubleshooting Information. The Troubleshooting Information tab will open.
   • Under the Application Basics section next to Profile Folder, click on Open Folder. Your profile folder will open.
2. Click the Firefox menu  , then click Exit.
3. Locate and delete the sessionstore.js file and any copies, such as sessionstore-1.js, sessionstore-2.js.

Change the PAC implementation

If you’re using a proxy auto-config file (PAC), Firefox may hang when you attempt to load sites that don’t exist or that you haven’t opened recently. To determine if you use an automatic proxy configuration file:

1. Click the menu button  and select Options.
2. In the General panel, go down to the Network Settings section.
3. Click Settings…. The Connection Settings dialog appears.
4. If Automatic proxy configuration URL is selected, you are using an automatic proxy configuration file. Do not disable this setting, which will prevent you from accessing the Internet. Instead, provide this workaround to your network administrator.
5. Click Cancel.

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