Examine source code of Boorumate

{
  "manifest_version": 2,
  "name": "Boorumate",
  "version": "1.5.16",
  "description": "Save images from boory-style image boards to a configurable directory.",
  "browser_specific_settings": {
    "gecko": {
      "id": "boorumate@chello.nl"
    }
  },
  "icons": {
    "48": "icons/Lite-Icon-icon.png"
  },
  "page_action": {
    "browser_style": true,
    "default_icon": {
      "19": "icons/Lite-Icon-icon-19.png",
      "38": "icons/Lite-Icon-icon-38.png"
    },
    "default_title": "button for page action"
  },
  "background": {
    "scripts": [
      "background-script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://tbib.org/index.php?page=post&s=view&id=*"
      ],
      "js": [
        "parsers/tbib.js"
      ]
    },
    {
      "matches": [
        "*://rule34.xxx/index.php?page=post&s=view&id=*"
      ],
      "js": [
        "parsers/rule34.js"
      ]
    },
    {
      "matches": [
        "*://gelbooru.com/index.php?page=post&s=view&id=*",
        "*://safebooru.org/index.php?page=post&s=view&id=*"
      ],
      "js": [
        "parsers/gelbooru.js"
      ]
    },
    {
      "matches": [
        "*://danbooru.donmai.us/posts/*",
        "*://safebooru.donmai.us/posts/*",
        "*://hijiribe.donmai.us/posts/*",
        "*://sonohara.donmai.us/posts/*"
      ],
      "js": [
        "parsers/danbooru.js"
      ]
    },
    {
      "matches": [
        "*://*.booru.org/index.php?page=post&s=view&id=*"
      ],
      "js": [
        "parsers/booru.js"
      ]
    },
    {
      "matches": [
        "*://konachan.com/post/show/*",
        "*://konachan.net/post/show/*",
        "*://yande.re/post/show/*"
      ],
      "js": [
        "parsers/konachan.js"
      ]
    },
    {
      "matches": [
        "*://e621.net/posts/*",
        "*://e926.net/posts/*",
        "*://e621.net/posts/*",
        "*://e926.net/posts/*"
      ],
      "js": [
        "parsers/ouroboros.js"
      ]
    },
    {
      "matches": [
        "*://chan.sankakucomplex.com/posts/*",
        "*://chan.sankakucomplex.com/*/posts/*"
      ],
      "js": [
        "parsers/sankaku.js"
      ]
    },
    {
      "matches": [
        "*://derpibooru.org/images/*"
      ],
      "js": [
        "parsers/derpibooru.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "downloads",
    "activeTab",
    "tabs",
    "storage",
    "notifications"
  ],
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Ctrl+F2"
      },
      "description": "Download the picture."
    }
  }
}