Download 3.6.6 from www.getfirefox.com. 3.5.10 has bugs that have been fixed in 3.6.x version of Firefox.

Make sure that you meet the system requirements.
Firefox 3.0 and 3.5/6 versions require at least Mac OS X 10.4

• http://www.mozilla.com/en-US/firefox/system-requirements.html - Mozilla Firefox 3.6 System Requirements

Firefox 2.0.0.20 is the last release that runs on Mac OS X 10.2 and 10.3
See http://kb.mozillazine.org/Installing_Firefox

Mac: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/

This really sucks. I have a 667 Tibook that won't allow me to install past OS 10.3.9 , and therefore I cannot get my browers current, and therefore cannot get the latest flash version download, and therefore can't effectively use this laptop which is quite capable of handling the task of watching video on the web. Effectively, these software updates are rendering my laptop into a paperweight because there are no exceptions and no workarounds. Is this just corporate sabotage of the consumers to drive new sales? Help.

Ran into this problem this afternoon. Had to download after the latest version failed to start after progressively becoming a bit tweeky. Got the failed to mount message also broken pipe, even though I am running 10.4.

I went into Mac OS Updates and downloaded the latest version of Java Script. After restart I was able to mount the new Firefox and it seems to be working now.

I thought this version was supposed to be universal in OSX period. Not just 10.4 and up. I'm running 10.3.9 and FF 2. My FireFox home page keeps telling me I URGENTLY need to upgrade to 3.6 so I downloaded it several times and every time it won't mount the volume and tells me it is corrupt. That really stinks and got me major disturbed. I have slow dial up and frequent isp server disconnection.