There's this mysterious appearing/disappearing icon in my Dock...

...that every so often spontaneously opens up, then closes right away. I can never get a good look at it, but it appears to be a white "page" (like the TextEdit dock icon) with what looks like a green part in the upper left corner and a black part in the lower right area.
What application might that icon belong to? And should I worry about it?

To clarify, it doesn't happen after each loading of a webpage -- I'm not even sure if it is triggered by opening a web page at all. Sometimes I'll just be watching the screen and it will happen.
Again, the trouble is that the icon just appears and disappears in the Dock before I can get a good look.
I'll try to take a full-screen snapshot (Command-Shift-3) the next time it appears, and hopefully I'll catch it in time...

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