Examine source code of Cairn

{
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDescription__",
  "version": "1.2.1",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "en",
  "permissions": [
    "storage",
    "unlimitedStorage",
    "contextMenus",
    "activeTab",
    "scripting",
    "search",
    "https://unifybrowse.com/*",
    "https://analytics.unifybrowse.com/*"
  ],
  "commands": {
    "save-page": {
      "suggested_key": {
        "default": "Ctrl+Shift+S",
        "mac": "Command+Shift+S"
      },
      "description": "Save the current page to Cairn"
    },
    "save-selection": {
      "suggested_key": {
        "default": "Ctrl+Shift+E",
        "mac": "Command+Shift+E"
      },
      "description": "Save the selected text to Cairn"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cairn@unifybrowse.com",
      "strict_min_version": "118.0",
      "data_collection_permissions": {
        "required": [
          "personallyIdentifyingInfo"
        ]
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_action": {
    "default_title": "Cairn",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}