'Command B' opens list of browser tabs in Google Chrome instead of making text bold
As the title says, in Google Chrome (and possibly elsewhere) 'Command B' keyboard combination has started opening a list of currently open browser tabs, instead of making highlighted text 'bold' in a dialog box, site comment thread etc.
Command I is still making text italic.
I've tried going to keyboard settings and changing it in Chrome shortcuts, but there's no 'Command B' listed. I've also tried looking within Google Chrome preferences and it's the same.
Appreciate any help reverting or removing this change of keyboard shortcut function.
iMac 27″, OS X 10.11