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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MozillaMaintenance
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\*
"DisableAppUpdate"=dword:00000001
]
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Clients\StartMenuInternet\FIREFOX.EXE\Capabilities]
"ApplicationName"="Mozilla Firefox"
"ApplicationDescription"="Web Browser"
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\firefoxURL]
@="URL:Firefox Protocol"
"URL Protocol"=""
[HKEY_CLASSES_ROOT\firefoxURL\shell\open\command]
@="\"C:\\Program Files\\Mozilla Firefox\\firefox.exe\" \"%1\""
If you manage multiple PCs, you can file a .reg script that sets Firefox policies.
Example: Block Firefox updates via Registry file regedit ff
| Scope | Registry Path | Purpose |
|-------|---------------|---------|
| Current User | HKEY_CURRENT_USER\Software\Mozilla\Firefox | User-specific settings (profiles, preferences) |
| All Users | HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Firefox | System-wide installation info |
| File Associations | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.htm | Which app opens .htm files (can be Firefox) |
| Default Programs | HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Application Association Toasts | Firefox’s status as default browser | Windows Registry Editor Version 5
Note: Modern versions of Firefox manage many settings internally, but critical integration points with Windows remain in the Registry. but when used correctly
If you’ve ever typed "file regedit ff" into a search engine, you are likely a Windows user trying to accomplish one of three things:
The Windows Registry is a hierarchical database that stores low-level settings for the operating system and applications like Mozilla Firefox. Mishandling it can crash your system, but when used correctly, "filing" (exporting/saving) Regedit keys is a powerful troubleshooting skill.
This guide walks you through everything you need to know about filing regedit data for Firefox, including step-by-step instructions, safety precautions, and advanced tweaks.