Examine source code of LinkPalette

{
  "manifest_version": 2,
  "name": "LinkPalette",
  "version": "0.1.3resigned1",
  "description": "Make your Web more colorful",
  "author": "maggiwuerze",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "LinkPalette",
    "default_popup": "popup.html"
  },
  "icons": {
    "225": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end",
      "js": [
        "jquery-3.3.1.min.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "tabs",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "admin@maggiwuerze.de"
    }
  }
}