I run Mac OS 10.4.11, installed "Friefox 3, it closes as soon as it opens.
I just downloaded the latest version of Firefox. Every time I click on the Firefox icon to open it, a blank page appears for half a second, then disappears.
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Hopefully this support article is what you need:
http://support.mozilla.com/en-US/kb/Firefox+crashes+when+you+open+it
In any case, it's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in safe mode (don't forget to select Disable all add-ons when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See this article for information about troubleshooting extensions and themes and this one for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.
I don't know how to open Firefox in safe mode. I just downloaded it again, and as soon as I try and open Firefox, a blank screen appears and disappears immediately. It disappears so quickly that I cannot access the Firefox menu.