Open some JSON with the add-on and put the focus into the browser pane.
Now move the mouse pointer over the expand/collapse button.
And then try pressing some global hotkey like Alt+D or Ctrl+C (you'd have to select some text first for the latter).
Observe that the hotkey does not work (focus is not put into the address bar, selected text isn't copied to clipboard).
Everything works fine again as soon as the mouse pointer is moved a little to not hover expand/collapse button.
Open some JSON with the add-on and put the focus into the browser pane. Now move the mouse pointer over the expand/collapse button. And then try pressing some global hotkey like Alt+D or Ctrl+C (you'd have to select some text first for the latter). Observe that the hotkey does not work (focus is not put into the address bar, selected text isn't copied to clipboard).
Everything works fine again as soon as the mouse pointer is moved a little to not hover expand/collapse button.