A Google extension without Omnibar Icon

Question

This is probably a simple question, but I'm trying to create a Google extension without an icon, one that just runs in the background without a popup or anything. What would I put into the manifest to get this to happen?

Answer 1

Simply remove this from the manifest.json:

...
"browser_action": {
    "default_icon": "icon.png"
},
...

Now the app will not appear in the top bar.