Image via Wikipediatype error components.classes cid is undefined
i have a pure and tested solution for it
during that time just close mozilla firefox and go in start then mozilla firefox start it in safe mode
you will get a dialog box check all the box (i.e there must be tick in all the boxes) and click on restart mozilla firefox and that time you will not get error
now
in mozilla go in tools=> addons and enable that addon which are need to you my suggestion enable shockwave , and flasH player and quiktime because those are important one
