Examine source code of GetMark

{
  "manifest_version": 2,
  "name": "GetMark",
  "version": "0.0.2",
  "description": "Mark the pages you visit and manage them easily with GetMark.",
  "permissions": [
    "storage",
    "activeTab"
  ],
  "applications": {
    "gecko": {
      "id": "waskekrishna@gmail.com",
      "strict_min_version": "60.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.js"
  ],
  "options_page": "dashboard.html"
}