Examine source code of Mikan

{
  "manifest_version": 2,
  "name": "Mikan",
  "version": "0.3.1",
  "description": "Enhance your mikanani.me experience",
  "homepage_url": "https://mikanani.me",
  "browser_action": {
    "default_icon": "./assets/icon128.png",
    "default_popup": "./src/popup/index.html"
  },
  "background": {
    "page": "./src/background/index.html",
    "persistent": true
  },
  "icons": {
    "16": "./assets/icon16.png",
    "32": "./assets/icon32.png",
    "48": "./assets/icon48.png",
    "128": "./assets/icon128.png"
  },
  "permissions": [
    "http://*.mikanani.me/",
    "http://mikanani.me/",
    "https://*.mikanani.me/",
    "https://mikanani.me/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "mikan@mikanani.me"
    }
  }
}