More than usual pop ups with pages freezing ?

Force Quit .

Press command + option + esc keys together at the same time. Wait.

When Force Quit window appears, select the Safari if not already.

Press Force Quit button at the bottom of the window. Wait.

Safari will quit.

Relaunch Safari holding the shift key down.

Identify and remove adware

http://www.thesafemac.com/arg/

or

use Adware Removal Tool.

http://www.thesafemac.com/art/

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