Hi everyone. I like to share some information, maybe there is someone out who has the same problem. WP 2.6.1 / Mac OS X 10.5.4 / Firefox 126.96.36.199
1. My Feed where not working with Firefox on Mac OS X (Safari worked)
2. The Wysiwig - Editor was not loading. Neither browser or system.
After several attempts in all kind of directions I got a hint in the german wp-forum.
In the wp-config.php file where two returns after the end of the PHP-Code.
/* That's all, stop editing! Happy blogging. */
I deleted both returns, so that the courser was behind the "?>" and saved the file. Done. Great. Everything worked.
have fun, wp is the greatest.