Examine source code of Trello branch name

{
  "manifest_version": 2,
  "name": "Trello branch name",
  "version": "1.13resigned1",
  "description": "Add a button on each trello card to create a git branch name from the card name",
  "icons": {
    "48": "images/icon_48.png",
    "96": "images/icon_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.trello.com/*"
      ],
      "js": [
        "arrive.min.js",
        "git.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "images/git_16.png"
  ],
  "permissions": [
    "clipboardWrite",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "{34385045-f80b-464b-980b-13f47e101692}"
    }
  }
}