sendMessage from extension background or popup to content script doesn't work

Question

I know that question has been repeatedly asked in different ways, but I tried to go through all the answers (hopefully I didn\'t miss anyone) and none of them worked for me.

Answer 1

@apsillers is correct. Also don't forget to return true in your content-script listener or it might close too early.

chrome.runtime.onMessage.addListener((message, sender, sendResponse) => {
    console.log(message)
    return true
});