Examine source code of AddOmmmm

{
  "id": "jid0-rDCwvHBdPyHNUj99GHl6uIIzMg0@jetpack",
  "description": "Plays weird meditational music, turns pages upside down and displays a lasagna with horse noises every 15 seconds.",
  "manifest_version": 2,
  "name": "AddOmmmm",
  "title": "AddOmmmm",
  "author": "tobbi",
  "version": "0.4.3resigned1",
  "license": "MPL-2.0",
  "homepage_url": "http://www.tobbi.ml",
  "icons": {
    "16": "data/icon16.png",
    "48": "data/icon48.png",
    "64": "data/icon64.png"
  },
  "applications": {
    "gecko": {
      "id": "jid0-rDCwvHBdPyHNUj99GHl6uIIzMg0@jetpack"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "data/addommmm.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "data/addommmm_background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "data/icon16.png",
      "48": "data/icon48.png",
      "64": "data/icon64.png"
    }
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "options_ui": {
    "page": "options.html"
  }
}