Page actions are a simple way to represent actions that can be taken on a page ("Email this page", "Share with Facebook", etc).

User interface

Page actions are displayed in the right side of the Omnibox. New actions get added to the left of the star:

A maximum of 8 (?) actions can appear at the top level, any additional ones overflow into a drop-down menu:

Manifest

Developers can include page actions in the manifest using the following syntax:

"page_actions": [
    {
      "id": "myaction",  // chosen by developer, and should be unique within their extension
      "name": "Do action",
      "icons": ["favicon.png", "favicon2.png"]
    }
  ]

Supported icon image formats include for example png, bmp, ico, jpg, gif. If an image larger than 16x16 is specified, it will be resized to fit.