Examine source code of Prompt Keeper

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "short_name": "Prompt Keeper",
  "description": "__MSG_appDescription__",
  "version": "1.0.1",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "storage",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "commands": {
    "save-selection": {
      "suggested_key": {
        "default": "Alt+Shift+P",
        "mac": "Alt+Shift+P"
      },
      "description": "__MSG_commandSaveSelection__"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Prompt Keeper",
    "default_icon": {
      "16": "icons/toolbar-16.png",
      "32": "icons/toolbar-32.png",
      "48": "icons/toolbar-48.png",
      "64": "icons/toolbar-64.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "prompt-keeper@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}