[removed] not working in chrome

Question

This is the code which i used for window.onbeforeunload......

Answer 1

None of the above worked for me. I was sending a message from the content script -> background script in the before unload event function. What did work was when I set persistent to true (in fact you can just remove the line altogether) in the manifest:

"background": {
    "scripts": [
        "background.js"
    ],
    "persistent": true
  },

The logic is explained at this SO question here.