Yes, Firefox 15 will run perfectly fine on your computer. It is likely that the updater got messed up on your machine. Your best solution is to go to www.getfirefox.com, download Firefox 16.0.1, and install that over your current install.

Hi jprusa,

Take a look at the system requirements for Firefox 16 which should be available in the next hour or so:

https://www.mozilla.org/en-US/firefox/16.0beta/system-requirements/

I don't think you should have any issues updating to that version. I would suggest you just try downloading a fresh copy from the downloads page. As I mentioned, 16.0.1 will be available later today. I'd wait for that version to be available!

Firefox 15 is or was the latest ordinary release of Firefox. Firefox 16 is in the process of being Released, but has had a couple of hiccups resulting in 16.01 and 16.02 being prepared as replacements.

Firefox normally now aims to release a new version about every 6 weeks. OS 10.5.03 is only supported up to Fx 16.

• Firefox no longer works with Mac OS X 10.5
• latest Releases from http://www.mozilla.org/en-US/firefox/all.html
• beta etc releases www.mozilla.org/en-US/firefox/channel
• version listing https://wiki.mozilla.org/RapidRelease/Calendar

If you are on Firefox 9 it is outdated, unsupported and not secure, so you should update. There is a remote possibility you are on a more up-to-date version than is showing aside.

• see Find what version of Firefox you are using
• Update Firefox to the latest release

Thanks to each of you. I just downloaded and installed 16.0.1 and everything seems to be working fine. Curious that updater just stopped working though... All the best, J. Prusa