You are unfortunately out of luck with an Intel Mac and OS X 10.4.11.

There is a Firefox 4 compatible third-party version TenFourFox from www.floodgap.com for a PowerPC Mac, but no alternative for an Intel Mac.

• http://www.mozilla.com/firefox/5.0/system-requirements/

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

Maybe you answered a question I didn't ask.

I had given up on the upgrade, but in the process my Firefox icon moved to a different place in the dock. How to move it back to where it was?