Examine source code of Mail Hash

{
  "name": "Mail Hash",
  "version": "0.1.3resigned1",
  "description": "Add a random hash to a plus addressable email address or to a custom domain",
  "manifest_version": 2,
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "16": "icon-16.png",
      "24": "icon-24.png",
      "32": "icon-32.png"
    },
    "default_title": "Mail Hash",
    "default_popup": "options.html"
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a1886c53-a2bc-4ac2-ad7e-8dd534b16173}"
    }
  }
}