Examine source code of Zest curator

{
  "manifest_version": 2,
  "name": "Zest",
  "description": "Easily build your curated news feed with RSS filtering",
  "version": "0.2.2",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "128": "icon/128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "storage",
    "contextMenus",
    "notifications",
    "<all_urls>"
  ],
  "sidebar_action": {
    "default_panel": "sidepanel.html",
    "default_title": "Zest - Panel"
  },
  "browser_action": {
    "default_title": "Zest"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zest@happytodev"
    }
  },
  "options_ui": {
    "page": "options.html"
  }
}