The Web Player for Spotify™ extension is a Chrome application to load the official Spotify web player inside an isolated window. This application can be used instead of the desktop version of Spotify as it supports almost all the desktop version's features. Note that the web player is loaded in an isolated (sandboxed) window which cannot interact with your browser hence you need to login into the player one more time. For extension version, there is an isolated iframe instead of webview and hence there is no need to login again if you already logged-in in your browser once.
Spotify Web Player (How to Use, Differences to Spotify Apps, Pros
Spotify Web Player: Exploring the Ultimate Streaming Experience
The Best Spotify Stats Websites and Apps - Tune My Music Blog
Y2mate extension - Opera add-ons
Awesome (And Unofficial) Spotify Web Player for Linux Discontinued
Spotify Web Player Search
6 Best Spotify Music downloader - Download Spotify songs to mp3
How to use the Spotify web player
Download - Spotify