Local for browser address book.
In order to see the app, one has to run http server of owns choice in the main folder.
There are 3 index files:
index.html: compiled to ES5 and minified (also CSS)index-raw.html: ES6+ native modules and not minified CSS
The last variant doesn’t work on Firefox without setting a flag in about:config (dom.moduleScrips.enabled). But other two work just fine.