I've filed a new issue (bug) report regarding the behavior of NVDA on the chrome://extensions/shortcuts page.
Thanks to Joseph and Sarah for the assistance.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.
~ H.L. Mencken, AKA The Sage of Baltimore