Hi Alex7398,

That depends on your computer. Is it PPC or Intel? You should take a look at the Firefox System Requirements page for more detailed information.

If it looks like your computer meets all of those requirements, you should read the Knowledge Base article Update Firefox to the latest release.

Hopefully this helps!

You can only run Firefox 3.6.x versions on a PowerPC Mac even with OS X 10.5.
If you have a later Firefox 5 version then that must be a TenFourFox build for a G4 powerbook.

Firefox 4 and later require at least OS X 10.5 and an Intel Mac.

• http://www.mozilla.com/firefox/9.0/system-requirements/

For an unofficial Firefox 9 compatible version (TenFourFox) that runs on PowerPC Macs with OS X 10.4.11 or OS X 10.5.8 you can look at:

• http://www.floodgap.com/software/tenfourfox/
• http://www.macupdate.com/app/mac/37761/tenfourfox

• http://code.google.com/p/tenfourfox/wiki/ReleaseNotes90
• http://code.google.com/p/tenfourfox/wiki/PluginsNoLongerSupported

Firefox 3.6.x (Mac OS X 10.4 and later) can be found here:

• http://www.mozilla.com/en-US/firefox/all-older.html

Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.5; en-US; rv:1.9.2.3) Gecko/20100401 Firefox/3.6.3

According to the "More system details..." link on right of your post you are actually using Firefox 3.6.3

The Mozilla/5.0 part is pretty much on all versions of Firefox since it was Phoenix 0.1.