Examine source code of Offline Browsing

{
  "manifest_version": 2,
  "name": "Offline Browsing",
  "description": "save web pages locally to read it offline",
  "version": "1.0.0",
  "icons": {
    "64": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "storage",
    "downloads",
    "notifications",
    "tabs"
  ],
  "developer": {
    "name": "Phuc Quang Tran",
    "url": "https://github.com/tranquangphuc"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "offline-browsing-extension@tranquangphuc.com",
      "strict_min_version": "55.0"
    }
  },
  "browser_action": {},
  "background": {
    "scripts": [
      "dist/background.js"
    ]
  },
  "page_action": {},
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "dist/content.js"
      ]
    }
  ]
}