Examine source code of Capture This

{
  "manifest_version": 2,
  "name": "Capture This",
  "version": "0.11",
  "description": "Capture text from a page and send it to the URL of your choice",
  "homepage_url": "https://github.com/josh-berry/capture-this/",
  "icons": {
    "48": "icons/logo-48.png",
    "96": "icons/logo-96.png",
    "128": "icons/logo-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "capture-this@josh-berry.github.io",
      "strict_min_version": "72.0"
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "contextMenus"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self';",
  "background": {
    "scripts": [
      "index.js"
    ]
  },
  "page_action": {
    "default_title": "Capture This",
    "default_icon": {
      "19": "icons/light/logo.svg",
      "38": "icons/light/logo.svg"
    },
    "theme_icons": [
      {
        "light": "icons/dark/logo.svg",
        "dark": "icons/light/logo.svg",
        "size": 19
      },
      {
        "light": "icons/dark/logo.svg",
        "dark": "icons/light/logo.svg",
        "size": 38
      }
    ],
    "browser_style": false,
    "show_matches": [
      "<all_urls>"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+C"
      }
    }
  }
}