If you got to try the A-Patch for Windows Live Messenger program, then, surely you miss something similar for Yahoo Messenger.
Therefore, its authors have specifically created this A-Patch for Yahoo Messenger, which performs the same functions but in Yahoo Messenger (works from version 8.1 or higher).
Thanks to this A-Patch for Yahoo Messenger you can, from your Yahoo Messenger, have different email accounts open simultaneously, configure some of the properties and features to your liking, eliminate the advertising of unwanted ads, etc.
You can free download A-Patch for Yahoo Messenger 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.