Examine source code of StackFlex

{
  "manifest_version": 2,
  "name": "StackFlex",
  "version": "1.0",
  "description": "Save your code from websites, use it from VSCode",
  "icons": {
    "48": "logo.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0f1872fb-2443-4418-ba9e-c07d1a9fe64a}"
    }
  }
}