Examine source code of ASS Danmaku

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "version": "1.15",
  "default_locale": "en",
  "icons": {
    "48": "icon/danmaku.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "downloads",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "lib/pbf@3.0.5/pbf.js",
      "background/main.js",
      "font/font.js",
      "options/ext_options.js",
      "danmaku/parser.js",
      "danmaku/ass.js",
      "danmaku/layout.js",
      "download/download.js",
      "background/acfun.js",
      "background/bilibili.js",
      "background/niconico.js",
      "background/bahamut.js",
      "background/himawari.js"
    ]
  },
  "page_action": {
    "browser_style": true,
    "default_popup": "popup/popup.html",
    "default_title": "__MSG_extensionButtonTitle__",
    "default_icon": "icon/danmaku.svg"
  },
  "options_ui": {
    "browser_style": true,
    "page": "options/options.html"
  },
  "applications": {
    "gecko": {
      "id": "{d9a7d273-90af-49c2-9379-887fe4848372}",
      "strict_min_version": "57.0a1"
    }
  }
}