Examine source code of Find and replace AZ

{
  "name": "Find and replace AZ",
  "description": "A tool that help you find and replace text.",
  "version": "3.5",
  "manifest_version": 2,
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "contextMenus",
    "<all_urls>"
  ],
  "icons": {
    "16": "find_and_replace.png",
    "32": "find_and_replace.png",
    "48": "find_and_replace.png"
  },
  "browser_action": {
    "default_icon": "find_and_replace.png",
    "default_popup": "index.html"
  },
  "background": {
    "scripts": [
      "service_worker.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "content.js",
        "in_page.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+1"
      },
      "description": "1"
    },
    "settings.keyboard_shortcut.cmd2": {
      "suggested_key": {
        "default": "Ctrl+2"
      },
      "description": "2"
    },
    "settings.keyboard_shortcut.cmd3": {
      "suggested_key": {
        "default": "Ctrl+3"
      },
      "description": "3"
    },
    "settings.keyboard_shortcut.cmd4": {
      "suggested_key": {
        "default": "Ctrl+4"
      },
      "description": "4"
    }
  },
  "web_accessible_resources": [
    "images/*",
    "find_and_replace.png",
    "index.html",
    "service_worker.js",
    "content.js",
    "in_page.js"
  ],
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d749dbf-0ad3-4696-a335-b4bb54c267d7}"
    }
  }
}