No images show in Firefox 3

You should try again with Firefox in Safemode (no extensions). The problem can be some extension that isn't really compatible with Firefox 3 or it's messing with the page in any way.

I tried starting Firefox in Safe Mode, but the problem persists !

http://www.ckfinder.com/demo

Yes, the CKFinder Demo works with Firefox 3 !
I'll compare my code and the demo code (css, js, ...) and post a solution tomorrow... I hope !!!
Thank you.

It works !!!
I downloaded the last version of CKFinder.
In the file "config.php", verify that :
- the CheckAuthentication() function return : true
- the variable $baseUrl is set to the local path of your userfiles folder (for example : $baseUrl = '/userfiles/'; if it's at the root of your website)
- the variable $baseDir is set to the complete path (depends on your web server) (for example : $baseDir = '/home/www/.../.../...../userfiles/'); //don't trust the resolveUrl function, comment it !

I hope it will work for you !

$baseUrl = 'http://example.com/ckfinder/userfiles/';

$baseUrl = '/ckfinder/userfiles/';

$baseDir = '/home/login/public_html/ckfinder/userfiles/';