manifest.json

{
  "manifest_version": 2,
  "name": "cookies.txt",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "version": "0.1",
  "default_locale": "en",
  "description": "__MSG_extDescription__",
  "developer": {
    "name": "Lennon Hill",
    "url": "https://github.com/lennonhill/cookies-txt"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "52.0"
    }
  },

  "background": {
    "scripts": ["background.js"]
  },

  "browser_action": {
    "default_title": "Export cookies",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },

  "permissions": [
    "cookies",
    "downloads",
    "<all_urls>"
  ]
}