Installation directory

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"Installation directory" (or program/application installation directory) refers to the directory or folder where the Firefox, Thunderbird, or Mozilla Suite program files are installed on your computer. Note that by default, this is completely separate from where your profile folder is stored. Listed below are typical installation directory locations.

This list is currently incomplete. Please add missing information and/or relevant comments for each OS.


This path may vary on a per-computer basis, depending on the options you chose when installing. Doing a search on your computer for the application executable (e.g., "firefox.exe") will help if you can't find where the application is installed.

Default locations are:

  • Firefox: C:\Program Files\Mozilla Firefox\
  • Thunderbird: C:\Program Files\Mozilla Thunderbird\
  • Mozilla Suite: C:\Program Files\Mozilla\


The path may vary and doing a search on your computer (from "/") for "firefox" or "mozilla" will help. If the application was installed using a standard update manager and not manually, this path is ususally:

  • Firefox: /usr/lib/firefox-<version>. For example, if using Firefox 1.0 it would be: /usr/lib/firefox-1.0
  • Mozilla Suite: /usr/lib/mozilla-<version> For example: /usr/lib/mozilla-1.7.3

Mac OS X

On Mac OS X, it is usually under your "Applications" folder. Clicking on the "" or "" will start the program, so if you want to open this folder and see the folders beneath: Ctrl-click "" (or "") and select "Show Package Contents". The folder should be at:

  • Firefox: /Applications/
  • Mozilla Suite: /Applications/