There used to be an option to open a file in Dropbox in your browser, but for some reason it's disappeared:

I can copy the Dropbox link and paste it into my browser to view it that way, but it's way less convenient than it was before.
I don't see why this option would have disappeared and am wondering if it's a bug or intended.
I have ran the Dropbox installer to update it, restarted the computer, and made sure that Dropbox in my browser is signed in, but the menu options remain the same.