Examine source code of ScratchFormat

{
  "name": "ScratchFormat",
  "description": "Rich text editing in Scratch.",
  "version": "26.0",
  "content_scripts": [
    {
      "matches": [
        "https://scratch.mit.edu/users*",
        "https://scratch.mit.edu/studios*",
        "https://scratch.mit.edu/projects*",
        "https://scratch.mit.edu/messages*"
      ],
      "js": [
        "loader.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "smod.js",
    "javascript.js"
  ],
  "browser_action": {
    "default_title": "ScratchFormat",
    "default_icon": "logo.png",
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "short_name": "SF",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f95ab463-c030-4448-848f-69c4e2d9ef76}"
    }
  }
}