clarification please.

[DeletedUser1647]

http://awesomescreenshot.com/05d3uwc9c0

Can some one explain this to me,(the GREEN tool bar)
came up, out of the blue, I did NOT downloaded it or APPLIED for it.

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after refreshing the page it was gone.

 

[DeletedUser80]

That was apparently the developer console. I don't know, why it was visible for you...

 

[DeletedUser1647]

sorry for the late reply, was away for work.
Thanks.