Examine source code of BBradley's Extended Shortcuts

{
  "manifest_version": 2,
  "name": "BBradley's Extended Shortcuts",
  "version": "2.9",
  "description": "This Add-on creates extra keyboard shortcuts to various websites for easier use. ",
  "applications": {
    "gecko": {
      "id": "brad@bbradley.net",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.facebook.com/*"
      ],
      "js": [
        "fb_main.js",
        "fb_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.pandora.com/*"
      ],
      "js": [
        "pandora_main.js",
        "pandora_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://docs.google.com/*"
      ],
      "js": [
        "gdocs_gsheets_gslides_main.js",
        "gdocs_gsheets_gslides_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://mail.google.com/*"
      ],
      "js": [
        "gmail_main.js"
      ]
    },
    {
      "matches": [
        "*://voice.google.com/*"
      ],
      "js": [
        "gvoice_main.js"
      ]
    },
    {
      "matches": [
        "*://*.hulu.com/search*"
      ],
      "js": [
        "hulu_search_main.js",
        "hulu_search_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.hulu.com/hub*"
      ],
      "js": [
        "hulu_main.js",
        "hulu_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.netflix.com/*"
      ],
      "js": [
        "netflix_main.js",
        "netflix_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "youtube_main.js",
        "youtube_navigation_functions.js"
      ],
      "css": [
        "youtube_css.css"
      ]
    },
    {
      "matches": [
        "*://*.youtubekids.com/*"
      ],
      "js": [
        "youtubekids_main.js",
        "youtubekids_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.bookshare.org/*"
      ],
      "js": [
        "bookshare_main.js",
        "bookshare_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.audible.com/*"
      ],
      "js": [
        "audible_main.js",
        "audible_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.web.skype.com/*"
      ],
      "js": [
        "skype_main.js",
        "skype_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "*://*.tiktok.com/*"
      ],
      "js": [
        "tiktok_main.js",
        "tiktok_navigation_functions.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "closepost.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ]
}