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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