Examine source code of Bold Highlighter

{
  "manifest_version": 2,
  "name": "Bold Highlighter",
  "version": "0.11",
  "content_scripts": [
    {
      "matches": [
        "https://www.tutorialspoint.com/*",
        "https://www.geeksforgeeks.org/*",
        "https://www.w3schools.com/*",
        "https://www.javatpoint.com/*",
        "https://stackoverflow.com/*",
        "https://www.quora.com/*"
      ],
      "js": [
        "highlightb.js"
      ]
    },
    {
      "matches": [
        "https://www.tutorialspoint.com/*",
        "https://www.w3schools.com/*",
        "https://www.javatpoint.com/*",
        "https://stackoverflow.com/*",
        "https://www.quora.com/*"
      ],
      "js": [
        "highlightstrong.js"
      ]
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "highlightp.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "logo.png"
  }
}