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Firefox: InstallingWindows

Installing Firefox on Windows


System Requirements

In order to use Mozilla Firefox your computer must have the following:

  •  A Pentium 4 or newer processor that supports SSE2
  •  Computer must be running Windows 2000 or later

To check system requirements for Firefox, go to:

Download and Install Firefox

  1. Open your internet browser (such as Microsoft Internet Explorer) and visit: http://www.mozilla.com/firefox/ or http://www.getfirefox.com This website automatically detects the version of Mozilla Firefox that works best with your computer. If you want to download Firefox for a different language or for a different operating system than the one detected, click "Other Systems and Languages" to see a list of all the others available.
  2. Click DOWNLOAD and your computer will start receiving the setup file. Once the download completes, close all of the programs you are using before you install Mozilla Firefox.
  3. Open the file (by double-click the file with your mouse) to start the Firefox install wizard.
    • If you are running Windows Vista, you may get a User Account Control prompt. In this case, allow the setup to run by clicking Continue.

    A welcome screen appears.

  4. Click Next to continue. The Setup Type screen appears. A "Standard" setup is selected by default (using the custom option is only recommended for experienced users).

  5. Firefox installs itself as your default browser. If you do not want Firefox to be your default browser, clear the check box Use Firefox as my default web browser.
  6. Click Next.
  7. Once Firefox has been installed, click Finish to close the setup wizard.


If the Launch Firefox now check box is checked, Firefox will start after you click Finish.

 Windows Vista Users:

If at any time throughout the installation process you are prompted with a User Account Control (UAC) window, press Continue, Allow, or Accept.


If you have problems starting Firefox, see http://support.mozilla.com/kb/Firefox+will+not+start 

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