Examine source code of Clipboard Manager

{
  "manifest_version": 2,
  "name": "Clipboard Manager",
  "version": "1.0",
  "description": "Save and manage the last 10 copied items",
  "icons": {
    "64": "icon64.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{bdd99b28-cec9-4835-b1f6-7f257841b2ac}",
      "strict_min_version": "110.0"
    }
  },
  "permissions": [
    "clipboardWrite",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "64": "icon64.png"
    }
  }
}