Examine source code of Asana Expander v2

{
  "description": "Automatically expands hidden content in Asana tasks and inbox",
  "version": "4.3.2",
  "name": "Asana Expander v2",
  "homepage_url": "https://github.com/structuredsoftware/asana-expander-extension",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "asana-expander-v2@structuredsoftware.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "*://*.asana.com/*"
  ],
  "browser_action": {
    "default_title": "Asana Expander v2",
    "default_popup": "src/popup/popup.html"
  },
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.asana.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_end"
    }
  ]
}