How do I know if I have Firefox installed?

Firefox is a popular web browser developed by Mozilla, known for its speed, security, and flexibility. If you're unsure whether you have Firefox installed on your computer, this guide will help you identify its presence using straightforward methods and simple steps.

Checking for Firefox on Windows:

  1. Start Menu Search:

    • Click on the Windows Start button (Windows logo).
    • Type "Firefox" in the search bar.
    • If Firefox is installed, it should appear in the search results.
  2. Programs and Features:

    • Press the "Windows key + R" on your keyboard to open the Run dialog.
    • Type "appwiz.cpl" and hit Enter.
    • Look for "Mozilla Firefox" in the list of installed programs.

Checking for Firefox on macOS:

  1. Spotlight Search:

    • Click on the magnifying glass icon in the top right corner of your screen.
    • Type "Firefox" in the search bar.
    • If Firefox is installed, it should appear in the search results.
  2. Applications Folder:

    • Open the Finder.
    • Click on "Applications" in the sidebar.
    • Look for "Firefox" in the list of applications.

Checking for Firefox on Linux (Ubuntu-based):

  1. Using Terminal:
    • Open the Terminal by pressing "Ctrl + Alt + T" or searching for it in the applications.
    • Type the following command and press Enter:
      firefox --version
    • If Firefox is installed, the version number will be displayed.

Identifying Firefox as the Default Browser:

  1. Windows:

    • Click on the Windows Start button (Windows logo).
    • Go to "Settings" (the gear icon).
    • Choose "Apps" and then "Default apps."
    • Look under "Web browser" - if Firefox is your default, it will be listed here.
  2. macOS:

    • Click on the Apple menu and choose "System Preferences."
    • Select "General."
    • Look for the default web browser - if it's set to Firefox, it will be indicated here.
  3. Linux (Ubuntu-based):

    • Open "Settings" from the application menu.
    • Go to "Details" or "Default Applications."
    • Check the "Web" or "Web Browser" section for Firefox.


Identifying whether Firefox is installed on your computer is relatively simple. By using the methods mentioned above, you can quickly confirm whether the browser is present on your Windows, macOS, or Linux system. If it's not installed, you can visit the official Firefox website to download and install the latest version for an enhanced browsing experience.