Examine source code of Text Select .click

{
  "manifest_version": 3,
  "name": "Text Select .click",
  "version": "2.0",
  "description": "Double-click selects hyphenated text + quick copy",
  "author": "Alex Fox",
  "homepage_url": "https://www.textselect.click",
  "permissions": [
    "clipboardWrite",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://textselect.click/*",
    "https://www.textselect.click/*"
  ],
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "js/styles.css"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "icons/pop-sound.wav"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    },
    "default_title": "Text Select .click",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "firefoxstore@textselect.click",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  }
}