While adding pages (using firefox) to my website suddenly the edit bar disappeared. Then i tried to log in again but after login i go straight to the website without edit bar. So it skips the dashboard page.

I can get to the dashboard page by going there directly but in the dashboard page the sitemap is completely empty..

The site itself works and contains all the pages.

I tried to perform maintenance but this doesn't work either.

After this i tried Google Chrome and there everything works!!!!

I made hunderds of pages in Firefox and now it stopped working, Anyone???