I see Zotero save button, but not icon to open Zotero library in a tab, in my browser.
Firefox just updated and wiped all of my Zotero connections--something that is incredibly scary and stressful for those of us with no sqlite and html and directory skills, whatever those things are--and I seem to have restored it. I can now double-click on my Zotero icon on my desktop and open the interface I used to see when I opened it in a tab in Firefox. In the toolbar for Firefox I have the little button--currently a webpage icon--so I can save whatever page I'm on, but how do I get the Zotero icon to come back so I can open it in a tab. None of the discussions I've seen seem to address this problem. Can you make it so Firefox updating doesn't wipe everything? It's really, really scary...
https://www.zotero.org/blog/a-unified-zotero-experience/
To continue using Zotero, you just need to download and install the Standalone Zotero 5 program:
http://zotero.org/download
You can't open Zotero in your browser anymore -- neither in a tab nor at the bottom of the browser window: https://www.zotero.org/blog/a-unified-zotero-experience/
Treat the open Standalone app just like you would did Zotero in your browser before. It contains almost all the same functionality with very, very few exceptions.