Yahoo Messenger extension for Google Chrome is now available from the Chrome Web Store which allows you to chat with your friends on Yahoo Messenger right from the Chrome browser, so if you are using Google’s browser you may not need to install Yahoo Messenger on Windows.

Yahoo Messenger for Google Chrome

Update December 23, 2014: The extension hasn’t been updated for a long time, and there are comments that extension isn’t working as advertised, so check it and stick with Windows version of YM if you’ve not found the extension useful.

Yahoo Messenger 11.5 Released with Tabbed IMs, Offline Installer Link Inside

After installing this extension, Yahoo Messenger icon will appear on the toolbar, click it and sign into Yahoo account and start chatting.

Yahoo Messenger for Chrome

Note: This is not official Yahoo Messenger extension from Yahoo.