What is the method to transfer information from a popup to the main content in a Chrome extension?

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One method to transfer information from a popup to the main content in a Chrome extension is through message passing using the chrome.runtime.sendMessage and chrome.runtime.onMessage API.

1. In the popup script, send a message with the information using chrome.runtime.sendMessage:

chrome.runtime.sendMessage({data: info});

1. In the main content script, listen for the message using chrome.runtime.onMessage:

chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
  if (message.data) {
    // use the information from the message
  }
});

1. Make sure both scripts have access to the chrome.runtime API by including it in the permissions section of the extension's manifest file:

"permissions": [
  "tabs",
  "activeTab",
  "storage",
  "http://*/",
  "https://*/",
  "chrome://favicon/",
  "chrome://extensions/",
  "chrome://resources/"
]