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mmm it's a really weird problem, at least you should be able to shutdown your system, using the ctrl+alt+shift+F3 key combination you should then see the TTY come up, then just write poweroff, hit enter and that's it...
P.D.: under some systems use ctrl+alt+F(and a number between 2 and 8) to get the TTY
for the time being,you can close your browser by right clicking on its top(where name of browser is shown usually) and choosing to close..
And for further help,please tell which distro and DE are you using ?
by now you have probably held the power button down for 4 seconds
reboot will most likely fix it , for now .
for a fix we would need to know some VERY basic information that should have been the first post
like What operating system is this ? and what version ?
What desktop is this ? gnome,kde,xfce,lxde, what ?
did you turn on any of the "3d effects " also known as the 3d desktop"