Examine source code of Surfingkeys

{
  "manifest_version": 2,
  "name": "Surfingkeys",
  "short_name": "Rich shortcuts in vim spirit for productivity with keyboard.",
  "description": "Rich shortcuts to click links/switch tabs/scroll, capture pages, use your browser like vim for productivity.",
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "commands": {
    "restartext": {
      "description": "Restart this extenstion."
    },
    "previousTab": {
      "description": "Go to the previous tab."
    },
    "nextTab": {
      "description": "Go to the next tab."
    },
    "closeTab": {
      "description": "Close the current tab."
    },
    "proxyThis": {
      "description": "Toggle current site in autoproxy_hosts."
    }
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "48": "icons/48.png"
    },
    "default_title": "Surfingkeys",
    "default_popup": "pages/popup.html"
  },
  "author": "brook hong",
  "permissions": [
    "nativeMessaging",
    "tabs",
    "history",
    "bookmarks",
    "scripting",
    "storage",
    "sessions",
    "downloads",
    "topSites",
    "clipboardRead",
    "clipboardWrite",
    "cookies",
    "contextualIdentities",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": true,
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    "pages/neovim.html",
    "pages/default.js",
    "pages/emoji.tsv",
    "pages/l10n.json",
    "pages/frontend.html",
    "pages/pdf_viewer.html",
    "pages/shadow.css",
    "pages/default.css"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "version": "1.17.11",
  "options_ui": {
    "page": "pages/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a8332c60-5b6d-41ee-bfc8-e9bb331d34ad}"
    }
  }
}