Examine source code of Anime Tracker

{
  "manifest_version": 2,
  "name": "Animé Track",
  "description": "Keeps track of the ridiculously short episodes on animetv.to",
  "version": "1.1resigned1",
  "author": "dissonance",
  "icons": {
    "32": "icons/animetrack-32.ico",
    "48": "icons/animetrack-48.ico"
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://www1.animetv.to/watch/*-episode-*",
        "https://www1.animetv.to/watch/*-episode-*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Animé Track",
    "default_icon": "icons/animetrack-48.ico",
    "default_popup": "popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b23921f5-12d7-4d83-83b1-e4cf56742c9d}"
    }
  }
}