Change downloads complete alert interval in Firefox

When you download a file using Mozilla Firefox and the downloads are completed, Mozilla Firefox shows an alert on the bottom-right of screen that downloads are complete. The time interval this alert is shown for is two seconds. The two seconds interval can be very small. If you want this alert to appear for a longer time, then you can set a longer interval. Here is how :

  1. Start Mozilla Firefox.
  2. Type about:config in the location bar and press Enter.
  3. Firefox will show a warning. Click on the button labeled I’ll be careful I promise! to proceed.

  4. In the Filter field type alertinterval. You would see a preference named as shown.

  5. It has a default value of 2000 (2000 milliseconds equaling 2 seconds). Double click on to change its value. You can set any value (in milliseconds of course) between 0 to 4 seconds. For example, if you want to set 4 seconds interval, set the value 4000.
  6. After changing the value, you do not have to restart the browser for the changes to take effect.