Examine source code of Incompat

{
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "1.2.2",
  "short_name": "__MSG_appShortName__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "images/icon-16.png",
    "19": "images/icon-19.png",
    "38": "images/icon-38.png",
    "48": "images/icon-48.png",
    "96": "images/icon-96.png",
    "128": "images/icon-128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon-19.png",
      "38": "images/icon-38.png"
    },
    "default_title": "__MSG_browserActionTitle__"
  },
  "permissions": [
    "activeTab",
    "https://github.com/",
    "webNavigation"
  ]
}