Examine source code of timimi

{
  "description": "Firefox addon to save Tiddlywiki",
  "manifest_version": 2,
  "author": "Rizwan Ishak",
  "name": "timimi",
  "version": "2.1.3",
  "icons": {
    "16": "icons/index.svg",
    "32": "icons/index.svg",
    "48": "icons/index.svg",
    "96": "icons/index.svg"
  },
  "applications": {
    "gecko": {
      "id": "timimi@tesseract.io",
      "strict_min_version": "57.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/index.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "file:///*"
      ],
      "js": [
        "content-script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "settings/options.html"
  },
  "permissions": [
    "nativeMessaging",
    "storage",
    "notifications"
  ]
}