Right-click the desktop shortcut for Firefox and view the Properties. The Target line will show you where firefox.exe is located.

You should see the installation path on the "Help -> Troubleshooting Information" (about:support) page under "Application Basics -> Application Binary".

That's it. Thank you.

C:\Users\Justin\AppData\Local\Mozilla Firefox

It looks like you installed Firefox in the /AppData/Local/MozillaFirefox/ folder rather than the more customary Program Files.

Firefox would normally be installed in one of these locations:

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"
• (32-bit Firefox) "C:\Program Files (x86)\Mozilla Firefox\"

How did you manage to get Firefox installed in "AppData\Local" and not remembering this ?

Edit: To clarify, the default Firefox installation location is usually one of the following:

• C:\Program Files\Mozilla Firefox\
  for 32-bit Firefox on 32-bit Windows or 64-bit Firefox on 64-bit Windows
• C:\Program Files (x86)\Mozilla Firefox\
  for 32-bit Firefox on 64-bit Windows

Ref: Custom installation of Firefox on Windows

the-edmeister said

It looks like you installed Firefox in the /AppData/Local/MozillaFirefox/ folder rather than the more customary Program Files.

I'm not sure why it was installed there. I just installed Firefox on another machine with Windows 10. The Mozilla installer doesn't show any options for changing the directory. On that machine Firefox was installed in the usual directory C:\Program Files.

C:\Users\Justin\AppData\Local\Mozilla Firefox was the default directory on this machine when installing. Why would the installer point to C:\Users?

Sorry for posting to an archived thread but I thought this was worth documenting, since it happened to me today when testing out the Firefox Installer.

Firefox installs to C:\Users\<username>\AppData\Local\Mozilla Firefox\ when you run the installer as administrator and cancel the UAC prompt (or if you install Firefox in a non-administrator account).

Related bugs: Bug 1357494 install firefox only for administrator Status: RESOLVED DUPLICATE of bug 1350974

Tortino Reporter Description • 2017-04-18 14:19 EDT <snip> Steps to reproduce: -on windows 10 logon as administrator user (or a user belonging to administratorS group) -run firefox setup -when asked if I want to modify the system I click no Actual results: firefox is not installed.

Expected results: firefox should install to C:\Users\<username>\AppData\Local\Mozilla Firefox\ only for the administrator user, just like it does for normal (ie not administrator) users. it seems that administrators users can only install firefox "system wide" and sometimes I don't want to.

Bug 1350974 Cancelling installer UAC prompt closes installer Status: VERIFIED FIXED Milestone: Firefox 55 Molly Howell (she/her) [:mhowell] Assignee Description • 2017-03-27 12:13 EDT STR: 1) Run a Firefox installer (stub or full, any channel) 2) Cancel the resulting UAC prompt

Expected behavior: The installer offers a default install path inside the user's home directory, then installation proceeds as normal without ever requiring elevation.

Actual behavior: The installer exits.

Romain Testard [:RT] Comment 15 • 2018-04-03 08:54 EDT (In reply to Chris More [:cmore] from comment #14) > Romain: can you verify if this is a regression or valid post Quantum stub installer?

Just tested it's still fixed in Win10 x64 - AFAIK this has been fixed since 55. Works as intended: 1 User dismisses the UAC prompt 2 Installer launches and installs to the user's home directory