Elon changed the url from twitter.com to x.com a few months ago. Here is how to get twitter.com back if you really hate the change.
Interesting fact
Elon set the twitter.com redirects using 302, which is a temporary redirect.
Right click on the bookmarks bar (if it isnt showing, use CTRL + SHIFT + B to get it back) and click "add page"
2. Name the bookmark whatever you want, and put https://twitter.com/x/migrate?mx=1 as the URL for the bookmark
Make sure the bookmark is saving to bookmarks bar
3. Save it
4. Test it by clicking on the bookmark
Now, when you click a twitter.com link, or reload a twitter.com link, it will bring you to x.com.
Change x.com to twitter.com
2. At the very end of the url put ?mx=1 with no spaces. If there is already a URL parameter, (?example=aero) put &mx=1 instead.