When you first click in the address bar, before you type anything for Firefox to match off of, it usually shows the first 4-10 shortcuts from the built-in Firefox Home/new tab page (also known as about:home).

After typing a couple of characters, you may see suggestions based on bookmarks (star icon), history, and open tabs, as well as real-time search engine suggestions and historical search entries.

To modify any of the above:

(1) You can curate your new tab page shortcuts so the initial list is useful. See: Customize items on your Firefox New Tab page.

(2) You can turn different categories of suggestions on/off. See: Address bar autocomplete suggestions in Firefox.

If you're seeing something that doesn't match up with those articles, can you share a screenshot of the mystery area? See: How do I create a screenshot of my problem?

Here is the screenshot.

Yes, those should match your Firefox Home page shortcuts. If you use a custom home page or custom new tab page, type or paste about:home in the address bar and press Enter to load it.

The blue star indicates a bookmarked URL, but I can't recall seeing the star on the Firefox Home page; that might only appear on the address bar drop-down.