Works for me (Firefox on Win 10 64-bit). I don't like the style very much, but the functionality's there.
EDIT: Nah! You're right. It's broken. You can only hide one section. If you hide a section, any others that you have previously hidden become visible again. You can also create your own sections, which is nice, but it doesn't remember them.
'Sir, please,' she said ... 'Will you not share your wisdom with us?'
'I have no wisdom,' he told her.
'Your experiences, then?'
'They have been trivial, uninteresting, and full of error.'
Iain M. Banks -- Feersum Endjinn
Edited by micksharpe (Mon 03-Jul-17 21:38:15)