This is silly, but one of the main things I like about Firefox is being able to drag a sizable JSON file on top of it and getting that JSON in treeview, with a search filter. It's convenient out-of-the-box functionality.
This is fantastic. I’ve always wondered why browsers don’t show HTML, CSS, and JS source with syntax highlighting, bracket matching, and other basic dev tools features. You are, after all, viewing the source.
So while not "bracket matching," it does have syntax highlighting and often it will even highlight bogus HTML in red