Examine source code of ScrapScripts

{
  "background": {
    "page": "background.html"
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'; connect-src * data: blob:;",
  "options_ui": {
    "page": "options.html"
  },
  "description": "Unofficial browser extension for Scrapbox",
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "128": "icon.png"
  },
  "manifest_version": 2,
  "name": "ScrapScripts",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "build/bundle.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://scrapbox.io/*",
        "http://localhost/*"
      ],
      "css": [
        "content_scripts_css/scrapbox-io/main.css"
      ],
      "js": [
        "build/scrapbox-io.js"
      ],
      "run_at": "document_end"
    },
    {
      "matches": [
        "*://gyazo.com/*"
      ],
      "css": [
        "content_scripts_css/scrapbox-io/main.css"
      ],
      "js": [
        "build/gyazo-com.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "contextMenus",
    "tabs",
    "activeTab",
    "clipboardRead",
    "<all_urls>"
  ],
  "version": "1.2.3resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{ca783640-928e-407b-9ddf-761bfab9fcda}"
    }
  }
}