Here is a video showing how to do it using firefox latest version’s snapshot builtin tool. When video maker draw , you see little numbers in right bottom corner which says 151,111 . These are the actual pixels of the image you need for this place. It means 151px in width, and 111px in height.
This video requires flashplayer plugin to enable, and runs best in firefox and internet explorer. if it still doesn’t work visit the video from direct link: https://www.screencast.com/t/wuE77WjOfQ
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