Examine source code of A-B-Week

{
  "manifest_version": 2,
  "name": "A-B-Woche",
  "version": "1.1",
  "applications": {
    "gecko": {
      "id": "a-b-woche@d-h-e.de"
    }
  },
  "author": "toggleMetrics",
  "description": "Zeigt A- oder B-Woche als Icon in der Toolbar an.\n Displays A- or B- week as icon on the toolbar.",
  "icons": {
    "16": "icons/dark/a-b-woche-16.png",
    "19": "icons/dark/a-b-woche-19.png",
    "32": "icons/dark/a-b-woche-32.png",
    "64": "icons/dark/a-b-woche-64.png",
    "128": "icons/dark/a-b-woche-128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/blue/a-b-woche-16.png",
      "19": "icons/blue/a-b-woche-19.png",
      "32": "icons/blue/a-b-woche-32.png",
      "64": "icons/blue/a-b-woche-64.png",
      "128": "icons/blue/a-b-woche-128.png"
    },
    "default_title": "A-B-Woche",
    "theme_icons": [
      {
        "light": "icons/light/a-b-woche-16.png",
        "dark": "icons/dark/a-b-woche-16.png",
        "size": 16
      },
      {
        "light": "icons/light/a-b-woche-19.png",
        "dark": "icons/dark/a-b-woche-19.png",
        "size": 19
      },
      {
        "light": "icons/light/a-b-woche-32.png",
        "dark": "icons/dark/a-b-woche-32.png",
        "size": 32
      },
      {
        "light": "icons/light/a-b-woche-64.png",
        "dark": "icons/dark/a-b-woche-64.png",
        "size": 64
      },
      {
        "light": "icons/light/a-b-woche-128.png",
        "dark": "icons/dark/a-b-woche-128.png",
        "size": 128
      }
    ]
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "incognito": "spanning"
}