sendMessage from extension background or popup to content script doesn't work
In your background page you should call
chrome.tabs.query({active: true, currentWindow: true}, function(tabs){
chrome.tabs.sendMessage(tabs[0].id, {action: "open_dialog_box"}, function(response) {});
});
instead of using chrome.extension.sendMessage
as you currently do.
The chrome.tabs
variant sends messages to content scripts, whereas the chrome.extension
function sends messages to all other extension components.
@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
});