From my perspective it is not at all related with manifest json. it something else… you can check manually by killing process.
Just with a simple search found below links, Hope you will get something from these links,let me know as well
https://productforums.google.com/forum/#!msg/chrome/BRIjeE9dgRk/rlWWv_LZwRIJ
https://productforums.google.com/forum/#!topic/chrome/7oImEYDuQyE
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