My browser crashed and pages menu

When I activated it, just did that and nothing else then I deactivated it for later use.

Didn’t notice until today some new pages where made that I wanted to go and delete for now.

Then I get this:
http://imgur.com/lNKYYyE,5CUNCUE

In firefox I get this:
http://i.imgur.com/5CUNCUE.png

https://wordpress.org/plugins/users-ultra/