Examine source code of Upvoty

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "images/icon-16.png",
      "32": "images/icon-32.png",
      "48": "images/icon-48.png",
      "128": "images/icon-128.png"
    },
    "default_popup": "popup/default_popup.html",
    "default_title": "__MSG_browserActionTitle__"
  },
  "default_locale": "en",
  "description": "__MSG_appDescription__",
  "homepage_url": "https://upvoty.com",
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "content_security_policy": "script-src 'self' https://*.upvoty.com; object-src 'self'",
  "permissions": [
    "activeTab",
    "contextMenus",
    "webRequest",
    "storage",
    "cookies",
    "http://*/*",
    "https://*/*"
  ],
  "short_name": "__MSG_appShortName__",
  "version": "1.0.0",
  "applications": {
    "gecko": {
      "id": "hi@upvoty.com",
      "strict_min_version": "57.0"
    }
  }
}