TenFourFox Icon


Harness the power of Firefox 31 on your PowerPC Mac.


TenFourFox comes in different tuned versions for specific PowerPC processor families:

  • TenFourFox G5
  • TenFourFox G4 - build 7450
  • TenFourFox G4 - build 7400 (also for 7410)
  • TenFourFox G3

If you feel unsure what type of PowerPC processor your Mac has, go to the Apple menu and choose "About this Mac" and check the processor field.

On the G4 Mac open the Terminal app (in Applications -> Utilities) and type the command machine and press return. You can read more in the Wiki entry; WhichVersion.

TenFourFox is a fast, efficient Web browser always based on the current version of Firefox, but unlike the main distribution TenFourFox is compatible with OS X 10.4 and 10.5 running on PowerPC processors.

TenFourFox does support most add-ons
The add-ons it does not support are those that contain native Intel code, or, on Tiger Macs (OS X 10.4), add-ons that contain native code that requires Leopard. You can continue to use add-ons compatible with the same version of Firefox in TenFourFox in most cases.

TenFourFox no longer supports plugins or Flash
As of the previous TenFourFox 6.0, for the following reasons plugin support ships disabled. Sites will now act as if no plugins were installed at all. For details and an in-depth explanation of this policy and other workarounds, see Why aren't plugins supported in TenFourFox?. You can reenable plugins at your own risk. See the section "Reenable plugins" below

Plugins on PowerPC are of special concern because Mozilla is making updates to their plugin architecture which may require the plugins themselves to be updated, and there are certain difficult-to-correct bugs with them already on Tiger. Most importantly, Adobe Flash for PowerPC is no longer maintained and has known security risks that can crash or leak data, some sites requires versions not available on the PowerPC, and QuickTime for Leopard will lose its own support with the release of OS X Lion.

For these and other reasons, TenFourFox does not run plugins, and they cannot be enabled.



  • All security and stability patches from Firefox ESR 31.8.0.

Known Issues

  • Remember: Plugins do not work in TenFourFox and can no longer be enabled. See PluginsNoLongerSupported for an explanation and suggested workarounds.
  • TenFourFox uses a lighter chrome for windows and dialogue boxes than prior versions or the official Mac Firefox. This is intentional.
  • Systems with large numbers of fonts installed may experience intermittent pauses.
  • Bitmap-only fonts (usually Type 1 PostScript) cannot be used by the 10.4Fx font renderer and are automatically ignored by the browser. A fallback font will be used in their place.
  • Personas and certain custom skins may hide the "traffic light" window buttons, but they are still present and will work if hovered over or clicked on (issue 247).
  • Not all webcams are supported; in addition, multiple webcams may not all appear depending on how they are connected (issue 221). For a list of supported webcam devices, see VideoDeviceSupport.
  • 10.4Fx does not currently support WebGL, WebRTC or the webapp runtime, and scripts such as Arabic or Indic requiring glyph reordering or language-specific ligatures may not appear correctly. See TechnicalDifferences for the complete list of changes necessary for 10.4Fx. See issue 5 for notes specific to the font issue.
  • Printing may crash the browser on Mac OS X Tiger Server (issue 279). Please note that Mac OS X Server is not supported currently.
  • Crash reporting is intentionally disabled to avoid polluting Mozilla's crash tracking system with our reports. Please use your system's crash logs if you are reporting a reproducible crash, or (if you are able) provide a gdb backtrace.
  • Although 10.4Fx will tell you when an update is available, you must download updates manually at this time.


File Size
39.6 MB
Operating Systems
Mac OS X
System Requirements
  • OS X 10.4.9 or later
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