ID:1279629
 
Resolved
The Feed tab could be closed with Ctrl+W.
BYOND Version:499
Operating System:Windows 7 Home Premium 64-bit
Web Browser:Chrome 29.0.1521.3
Applies to:BYOND Pager
Status: Resolved (499.1191)

This issue has been resolved.
No idea how I missed this in testing, but you can close the feed tab using the shortcut CTRL+W.
Lummox JR resolved issue with message:
The Feed tab could be closed with Ctrl+W.