Examine source code of Yt Stats!

{
  "manifest_version": 2,
  "name": "Yt Stats!",
  "version": "1.1resigned1",
  "description": "Addon counting how many times you watched each video on YouTube",
  "icons": {
    "48": "icons/icon.png"
  },
  "browser_action": {
    "default_icon": {
      "38": "icons/toolbar.png"
    },
    "default_title": "Yt Stats!"
  },
  "permissions": [
    "*://www.youtube.com/*",
    "webNavigation",
    "storage",
    "history",
    "tabs",
    "alarms"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "kukis13@gmail.com",
      "strict_min_version": "42.0"
    }
  }
}