Please describe the problem:
After the page info window has been opened, about:config stops working.

Attempting to change a setting that would require a dialog box (that is, a string or integer setting) does nothing; thereafter the about:config tab can not be closed, no further web pages will load, and epiphany will not exit.

Steps to reproduce:
1. Go to gnome.org
2. View -> Page Information
3. Close the page info window
4. In a new tab, go to about:config
5. double-click an Integer setting such as accessibility.tabfocus
6. observe that nothing happens
7. try to close the about:config tab
8. observe that nothing happens
9. Refresh the gnome.org tab
10. observe that the page does not load
11. close the epiphany window
12. observe that the epiphany process does not exit


Actual results:


Expected results:


Does this happen every time?
Yes

Other information:
Using xulrunner 1.9.0.1 backend