Examine source code of cineconfiltros

{
  "manifest_version": 2,
  "version": "0.1.0",
  "name": "cineconfiltros",
  "description": "Adds a button to the address bar when visiting https://www.cinecolombia.com. Click on this button to display a set of options to filter the list of movies showed in the page. Movies can be filtered by date, time, language, format and venue.",
  "homepage_url": "https://github.com/cineco-con-amor/cineconfiltros",
  "icons": {
    "48": "icons/main.svg",
    "96": "icons/main.svg"
  },
  "background": {
    "page": "background/state.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.cinecolombia.com/bogota",
        "*://www.cinecolombia.com/barranquilla",
        "*://www.cinecolombia.com/armenia",
        "*://www.cinecolombia.com/bucaramanga",
        "*://www.cinecolombia.com/cartagena",
        "*://www.cinecolombia.com/ibague",
        "*://www.cinecolombia.com/manizales",
        "*://www.cinecolombia.com/medellin",
        "*://www.cinecolombia.com/monteria",
        "*://www.cinecolombia.com/cali",
        "*://www.cinecolombia.com/pereira",
        "*://www.cinecolombia.com/popayan",
        "*://www.cinecolombia.com/villavicencio",
        "*://www.cinecolombia.com/*/cartelera",
        "*://www.cinecolombia.com/*/pronto"
      ],
      "js": [
        "util/globals.js",
        "content/actuator.js"
      ],
      "run_at": "document_end"
    }
  ],
  "page_action": {
    "browser_style": true,
    "default_icon": "icons/main.svg",
    "default_title": "...con amor",
    "default_popup": "popup/popup.html",
    "show_matches": [
      "*://www.cinecolombia.com/bogota",
      "*://www.cinecolombia.com/barranquilla",
      "*://www.cinecolombia.com/armenia",
      "*://www.cinecolombia.com/bucaramanga",
      "*://www.cinecolombia.com/cartagena",
      "*://www.cinecolombia.com/ibague",
      "*://www.cinecolombia.com/manizales",
      "*://www.cinecolombia.com/medellin",
      "*://www.cinecolombia.com/monteria",
      "*://www.cinecolombia.com/cali",
      "*://www.cinecolombia.com/pereira",
      "*://www.cinecolombia.com/popayan",
      "*://www.cinecolombia.com/villavicencio",
      "*://www.cinecolombia.com/*/cartelera",
      "*://www.cinecolombia.com/*/pronto"
    ]
  }
}