Examine source code of Capture EndNote Referencek

{
  "manifest_version": 2,
  "name": "Capture EndNote Reference",
  "author": "Filippo Airaldi",
  "version": "1.1.1",
  "description": "Capture a reference with just one click.",
  "homepage_url": "https://github.com/FilippoAiraldi/CaptureEndNoteReference",
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "scripts/contentscript.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "Capture EndNote Reference",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png",
      "96": "icons/icon-96.png",
      "128": "icons/icon-128.png"
    }
  },
  "web_accessible_resources": [
    "scripts/popup.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{85d9d2ef-1967-4811-893e-c76d88a225f4}"
    }
  }
}