Examine source code of Better Local File Viewer

{
  "manifest_version": 2,
  "description": "A better way to browse files: less-restricted from the OS. Supports Videos and Images currently.",
  "name": "Better Local File Viewer",
  "version": "1.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "cwasy_amewicansbetterlocal@hotmail.com1"
    }
  },
  "content_scripts": [
    {
      "js": [
        "node_modules/freezeframe/dist/freezeframe.min.js",
        "main/common.js",
        "main/Queue.js",
        "main/content-script.js"
      ],
      "css": [
        "main/styleGrid.css"
      ],
      "run_at": "document_idle",
      "matches": [
        "file:///*"
      ]
    }
  ],
  "background": {
    "scripts": [
      "main/background-script.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "popup/popup.html"
  },
  "browser_action": {
    "default_icon": {
      "16": "/popup/icon16.png"
    },
    "default_title": "Better local File Browsing",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "16": "popup/icon16.png"
  },
  "web_accessible_resources": [
    "node_modules/freezeframe/dist/freezeframe.min.js"
  ],
  "permissions": [
    "tabs",
    "webNavigation",
    "storage",
    "<all_urls>"
  ]
}