firefox.exe process points to the free and open-source web browser by the developer Mozilla Foundation and its subsidiary, Mozilla Corporation. The web browser is developed for a number of Operating Systems including, Windows, Linux and OS X. Firefox is also available on for the Android mobile platform. It is recommended not to close this safe process if it is active within the Task Manager. Doing so will close the browser, potentially losing any open sites which are accessed.
Additionally, if you notice any problems with the process or the browser you can trigger a reinstallation from the following site: https://www.mozilla.org/


Non-system processes like firefox.exe originate from software you installed on your system. Since most applications store data on your hard disk and in your system's registry, it is likely that your computer has suffered fragmentation and accumulated invalid entries which can affect your PC's performance.

In Windows Task Manager, you can see what CPU, memory, disk and network utilization is causing the Mozilla Firefox process. To access the Task Manager, hold down the Ctrl + Shift + Esc keys at the same time. These three buttons are located on the far left of your keyboard.

This process is considered safe. It is unlikely to pose any harm to your system. The firefox.exe file should be located in the folder C:\Program Files\MOZILLA FIREFOX. Otherwise it could be a Trojan.

This process is not considered CPU intensive. However, running too many processes on your system may affect your PC’s performance. To reduce system overload, you can use the Microsoft System Configuration Utility (MSConfig) or the Windows Task Manager to manually find and disable processes that launch upon start-up.

Use the Windows Resource Monitor to find out which processes and applications write/read the most on the hard drive, send the most data to the Internet, or use the most memory. To access the Resource Monitor, press the key combination Windows key + R and then enter 'resmon'.