I'm running macOS 10.14.6 and no matter what browser I use (Firefox, Edge (Beta), Chrome, and Safari), Confluence pages seem to block the standard "open location" (⌘L) and "hide" (⌘H) keystrokes.
I've searched through the community pages and cannot find much that would be helpful.
With the same browser window open I can create a new tab (that keystroke seems to work) and from there I can use the ⌘L or ⌘H keystrokes.
If it's pilot error, I'm willing to learn my the error of my ways.