Examine source code of RapidSave Reddit

{
  "manifest_version": 2,
  "name": "RapidSave Context Menu",
  "version": "1.0",
  "description": "Add 'Download on RapidSave' to context menu for Reddit links.",
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{182f92e4-e427-41d9-8eee-bf8810facaa3}"
    }
  }
}