I installed the plugin and added a widget to test.
I get the following error in Firefox:
The page isn't redirecting properly
Firefox has detected that the server is redirecting the request for this address in a way that will never complete.
This problem can sometimes be caused by disabling or refusing to accept cookies.
And I get the following error in Safari:
Safari can’t open the page.
Too many redirects occurred trying to open “http://dev.mysite/”. This might occur if you open a page that is redirected to open another page which then is redirected to open the original page.
I'm using WP-Super Cache.