This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

What registry keys indicate that Firefox is installed?

more options

On windows machines, what registry keys can i look at to determine if Firefox is installed? So far I've been looking for HKLM\Software\Mozilla\Firefox but have just found a user's machine where that key doesn't exist but they have firefox. It seems they have firefox installed to C:\Users\xxx rather than Program Files so I'm assuming there's a way for non-admin users to install it only into their User section, and the installer only writes to HKCU section of the registry. In this user's case there were HKCU registry entries like this, among others:

[HKEY_CURRENT_USER\Software\Mozilla\Mozilla Firefox\31.0 (x86 en-US)\Main] "Install Directory"="C:\\Users\\ausername\\AppData\\Local\\Mozilla Firefox" "PathToExe"="C:\\Users\\ausername\\AppData\\Local\\Mozilla Firefox\\firefox.exe"

On windows machines, what registry keys can i look at to determine if Firefox is installed? So far I've been looking for HKLM\Software\Mozilla\Firefox but have just found a user's machine where that key doesn't exist but they have firefox. It seems they have firefox installed to C:\Users\xxx rather than Program Files so I'm assuming there's a way for non-admin users to install it only into their User section, and the installer only writes to HKCU section of the registry. In this user's case there were HKCU registry entries like this, among others: [HKEY_CURRENT_USER\Software\Mozilla\Mozilla Firefox\31.0 (x86 en-US)\Main] "Install Directory"="C:\\Users\\ausername\\AppData\\Local\\Mozilla Firefox" "PathToExe"="C:\\Users\\ausername\\AppData\\Local\\Mozilla Firefox\\firefox.exe"

Modified by rkn005

All Replies (1)

more options

You may can go here https://developer.mozilla.org/en-US/docs/Accessing_the_Windows_Registry_Using_XPCOM


I'm not a developer you may contact a developer to help your problem.