Examine source code of Blookmark

{
  "manifest_version": 2,
  "name": "Blookmark",
  "version": "1.0.0",
  "description": "Simple floating bookmark overlay with grid positioning",
  "permissions": [
    "storage",
    "contextMenus",
    "activeTab",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background_firefox.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_firefox.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "browser_action": {
    "default_popup": "popup_firefox.html",
    "default_title": "Add as Blookmark",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb850d6a-c353-40cf-a529-c45d418ba333}"
    }
  }
}