never showed up. Rated 1 out of 5 stars

>While on any Flickr page, click on the Flickriver button to show the corresponding view via Flickriver.

button? what button?
i can't see a button which looks like anything which might be a flickr(river) button.
tried to customise the toolbar, no button.
right-click-menus, no button

where the heck is that button?

what about an instruction for new users?

one star, because the website is nice.