Examine source code of Drag to Save

{
  "manifest_version": 2,
  "name": "Drag to Save",
  "version": "1.4resigned1",
  "description": "Offline Read Later list manager, for links!",
  "applications": {
    "gecko": {
      "id": "{d67f56e8-7277-45cb-9f12-e48e595c24c0}"
    }
  },
  "icons": {
    "48": "icons/drag-to-save-48.png",
    "96": "icons/drag-to-save-96.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/drag-to-save-32.png",
    "default_title": "Drag to Save",
    "default_popup": "popup/dts-popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "css": [
        "content_scripts/drag-to-save.css"
      ],
      "js": [
        "content_scripts/drag-to-save.js"
      ]
    }
  ]
}