Examine source code of Copy With Context

{
  "manifest_version": 2,
  "name": "Copy With Context",
  "version": "2.1",
  "description": "Copies selected text into the clipboard with page title and URL appended. Click the button or Alt+Shift+C to copy.",
  "author": "Joakim Almgren",
  "homepage_url": "https://github.com/joakimoa/copywithcontext",
  "icons": {
    "48": "icons/copy48default.png",
    "96": "icons/copy96default.png"
  },
  "permissions": [
    "activeTab",
    "clipboardWrite",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b1e701de-ecd6-4b50-809c-2f89456055e3}",
      "strict_min_version": "70.0"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/copy32dark.png",
    "default_title": "Copy selected text with page title and URL appended (Alt+Shift+C)",
    "theme_icons": [
      {
        "light": "icons/copy32light.png",
        "dark": "icons/copy32dark.png",
        "size": 32
      },
      {
        "light": "icons/copy16light.png",
        "dark": "icons/copy16dark.png",
        "size": 16
      }
    ]
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Shift+C"
      }
    }
  }
}