Keyboard shortcuts do not conflict with common browser or system defaults

Extension shortcuts that collide with Chrome-reserved combinations (Ctrl+T, Ctrl+W, Ctrl+Shift+N, Ctrl+L, Ctrl+R, F5) get silently dropped by Chrome during registration — the manifest declares them, the extension looks configured, but the shortcut never fires. Users file bug reports about features that do not work, developers waste cycles investigating non-bugs, and support costs climb. Conflicts with OS-level shortcuts (Cmd+Space, Win+L) cannot be overridden at all and make the extension appear broken on specific platforms.

Use Alt+Shift+{Key} or MacCtrl+Shift+{Key} patterns in manifest.json — these bindings are reliably available to extensions on all platforms Chrome supports. Declare platform variants explicitly:

{
  "commands": {
    "toggle-feature": {
      "suggested_key": { "default": "Alt+Shift+F", "mac": "MacCtrl+Shift+F" },
      "description": "Toggle feature"
    }
  }
}

Verify registration in a clean Chrome profile at chrome://extensions/shortcuts.