Apparently they have removed some options — like turning off javascript easily. I’ve reset my options under Tools not to update without my approval.
Yeah, and they've removed the ability to easily change search engines, too. It now requires a convoluted process to go from one to another:
Search provider changes
Up until Firefox 22 Firefox users were able to select different search engines for the browser's address bar and the search bar. You could set the address bar search to use DuckDuckGo and the search bar Google or Bing for instance.
With Firefox 23 comes a unified search experience that removes this option. There is only one search provider in Firefox which will be used by the address bar and the search bar.
That's a problem if you want to use different providers to be flexible in your searches, and while it is possible to use keywords to run searches on different engines in the address bar, it means that you need to type more for the same effect.
You can revert the change by installing the add-on keyword.URL Hack! which adds the original functionality back to the Firefox web browser.
Firefox 23.0: Find out what is new
Bastards!