Use browser shortcuts to bring up UI, and then in UI trap keyboard there (TODO confirm this is possible) which would be a documentation/instructions + code change.
Click the three dots expansion menu in the upper right corner of Google Chrome.
Open the More Tools menu.
Select Extensions.
In the upper left corner, click on the hamburger icon and select Keyboard Shortcuts.
Find the desired extension and press a combination of “Ctrl” or “Ctrl + Shift” and any other available key.