Why did you change it when it worked, I guess we are talking about your local setup now?
To see what line caused the setup to break ⌠Yes, this is the local setup. The strange thing is that I reverted the edit, but itâs still broken.
Hm, what exactly does broken mean? What sort of error message?
When I type localhost into the browser, it doesnât load anything (NS_ERROR_CONNECTION_REFUSED)
Have you tried to throw the file away and create a new one with the original content I posted above?
I have â still no connection. Created a new file, pasted the code, saved, sudo chown www:www .htaccess, sudo chmod 644 .htaccess, sudo apachectl restartâ nothing.
And is your localhost working otherwise? NS_ERROR_CONNECTION_REFUSED sounds like Kirbyâs .htaccess might actually working, but your localhost server not responding correctly. Have you tested it with a normal PHP script? E.g. phpinfo
Youâre right, that doesnât seem to work either. I created a phpinfo.php file in the root directory, but when I try to access it in the browser (https://localhost/phpinfo.php), Iâm getting the same error message as before. Itâs odd, because the whole thing did work for a brief moment. After I changed .htaccess, it stopped working.
The only thing tail -f access_log is saying is
127.0.0.1 - - [05/Jun/2024:11:03:46 +0200] "GET / HTTP/1.1" 200 5185
OK, this thread is getting off topic with my httpd setup issues 
The solution to my original question was to update Kirby to 3.10.0 and PHP to 8.3. The SEO-Plugin works â thanks @tobimori for your work!