Examine source code of Drop CSV Viewer

{
  "manifest_version": 2,
  "name": "Drop CSV Viewer",
  "version": "1.4.1",
  "description": "Opens .csv / .tsv files in Firefox as a searchable, sortable table.",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg",
    "128": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "csv-table-viewer@aybarra",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "webNavigation",
    "file:///*",
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "run_at": "document_idle",
      "all_frames": false,
      "js": [
        "dropviewer.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "viewer.html"
  ]
}