This article covers the situation where Firefox displays a message about crashing when you try to download files or save images.

• For other crash related issues, see the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

Firefox crashes when attempting to perform a scan

With some security software, the scan after files are downloaded may cause Firefox to crash.

1. Disable temporarily each real-time protection one at a time until that stops the crashes.
2. Try updating the interfering program to its latest version and enable it again. If Firefox still crashes, there are two possible cases:
   • The interfering program is your only real-time protection:
     Try to switch to another anti-virus program with a real-time protection. If you can't or don't want, you can disable virus scanning in Firefox with the following steps:
     Warning: Disabling virus scanning may harm your computer's data or performance.
     1. Type about:config in the address bar and press EnterReturn.
        A warning page may appear. Click Accept the Risk and Continue to go to the about:config page.
     2. In the Filter box, type browser.download.manager.scanWhenDone.
     3. Double-click the browser.download.manager.scanWhenDone preference and change its value to false.
   • The interfering program is not your main real-time protection:
     Disable the program and, if you don't need it, uninstall it.