Examine source code of firePaste

{
  "manifest_version": 2,
  "name": "firePaste",
  "version": "3resigned1",
  "description": "Create custom scripts with access to the clipboard",
  "homepage_url": "https://github.com/MZanggl/firePaste",
  "icons": {
    "48": "icons/firepaste-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "firePaste.js"
      ]
    }
  ],
  "permissions": [
    "clipboardRead",
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "icons/firepaste-16.png",
      "32": "icons/firepaste-32.png"
    }
  },
  "options_ui": {
    "page": "webpartials/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a188b086-3116-45e4-b477-9cde95ed9b87}"
    }
  }
}