Examine source code of Right-Click Freedom

{
  "manifest_version": 2,
  "name": "Right-Click Freedom",
  "version": "6.2",
  "description": "Restores the context menu, text selection and copying on pages that disable them.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{9c7204fa-9979-40e7-9376-3ac091571d85}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "graphics/icon32.png",
    "48": "graphics/icon48.png",
    "64": "graphics/icon64.png",
    "96": "graphics/icon96.png",
    "128": "graphics/icon128.png"
  },
  "permissions": [
    "activeTab",
    "storage"
  ],
  "browser_action": {
    "default_popup": "app/popup.html",
    "default_title": "Right-Click Freedom",
    "default_icon": {
      "32": "graphics/icon32.png",
      "48": "graphics/icon48.png",
      "64": "graphics/icon64.png",
      "96": "graphics/icon96.png",
      "128": "graphics/icon128.png"
    }
  },
  "web_accessible_resources": [
    "app/core.js",
    "app/content.js"
  ]
}