Pressing Ctrl-O or Cmd-O should be discouraged

```
Currently 'O' is the keyboard shortcut to load a new file.  However, Cmd-O (or 
Ctrl-O in Windows/Linux) lets the _browser_ open a new page.  Potentially think 
about overriding this default behavior and using kthoom's powers of opening 
files instead.
```

Original issue reported on code.google.com by `codedr...@gmail.com` on 12 Jun 2014 at 6:15
