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Chrome Extension Content-Script as Listener & Popup as Sender, But Gives Receiving End Does Not Exist

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This extension is for google meet. What I have written in manifest.json is wrong, line "matches": ["*://*.meet.google.com/*"], should be "matches": ["*://meet.google.com/*"],
Original Question
I have this chrome extension, I want to let my contentScript.js to search for an element (tag) in a webpage when I press a button in popup.html. I set the sending message part in popup.js and the sending seems to work fine. But when I tried to receive it on the contentScript.js, console.log gives me Unchecked runtime.lastError: Could not establish connection. Receiving end does not exist.
May someone please help me, any suggestions are welcome.
Code snippets:
popup.js
retrieveTabId();
function retrieveTabId() {
chrome.tabs.query({currentWindow: true, active: true}, function (tabs) {
var activeTab = tabs[0];
console.log("tabID", activeTab.id);
tabId = activeTab.id;
});
}
document.getElementById("btn").addEventListener('click', function (){
chrome.tabs.sendMessage(tabId, {type: "listener"}, function(response) {
console.log((response.success));
});
console.log("tabID", tabId);
})
content-script.js
chrome.runtime.onMessage.addListener(
function (request, sender, sendResponse) {
if (request.type == 'listener') {
try {
let textarea = document.getElementsByTagName('textarea');
if (textarea.length == 0) {
sendResponse({success: false});
}
else {
console.log('find node -- textarea' + textarea);
sendResponse({success: true});
}
}
catch (e){
console.log(e);
sendResponse({success: false});
}
}
}
);
manifest.json
{
"name": "name",
"description": "Build an Extension!",
"version": "1.0",
"manifest_version": 3,
"permissions": ["storage", "activeTab", "scripting", "downloads", "notifications", "<all_urls>", "tabs"],
"action": {
"default_popup": "popup.html"
},
"background": {
"service_worker": "background.js"
},
"content_scripts": [{
"matches": ["*://*.meet.google.com/*"],
"js": ["contentScript.js"]
}]
}

send a message from content script to popup script

i'm trying to send a message from my content script to my popup script because i need to use popup DOM when a page is loaded, here's what i tried :
contentScript.js
window.addEventListener("load", function() {
chrome.runtime.sendMessage({
"action": "init"
});
})
popup.js
chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) {
if (request.action == "init") {
alert('Initialisation demandée...')
} else {
alert('Je n\'ai pas compris')
}
})
manifest.json
{
"manifest_version": 2,
"name": "Youtube color modifier",
"description": "Change youtube colors",
"version": "1.0",
"page_action": {
"default_icon": "icon.png",
"default_title": "Youtube color modifier",
"default_popup": "popup.html"
},
"permissions": [
"activeTab"
],
"content_scripts": [{
"matches": ["<all_urls>"],
"js": ["contentScript.js"]
}]
}
Thank you for helping a noob :))

If you have a content script, it will be run everytime you (re)load the page, assuming that the page you are visiting is registered in the manifest.json.
So instead of this:
window.addEventListener("load", function() {
chrome.runtime.sendMessage({
"action": "init"
});
})
simply try this:
chrome.runtime.sendMessage({
"action": "init"
});

Chrome extension messaging from popup to content script

I'm trying to send a message from my popup.js to a content.js and I just don't get why it doesn't work.
Here is my set up:
manifest.json
{
"manifest_version": 2,
"name": "Form Builder",
"description": "This extension populates a form.",
"version": "0.1",
"content_scripts": [{
"all_frames": true,
"matches": ["http://*/*", "https://*/*"],
"js" : [
"/js/jquery/jquery.min.js",
"/js/formLoader.js",
"/js/content.js"
]
}],
"options_page": "/html/options.html",
"permissions": ["https://localhost:8443/",
"tabs", "activeTab", "storage", "background"
],
"icons": { "16": "/images/icons/wb_icon_16.png",
"48": "/images/icons/wb_icon_48.png",
"128": "/images/icons/wb_icon_128.png"
},
"browser_action": {
"default_popup": "/html/popup.html"
}
}
content.js
chrome.extension.onRequest.addListener(function(request, sender, sendResponse){
sendResponse("received message: " + request);
formLoader.setFormData(request, sendResponse);
// Why isn't this getting executed when I send a message from popup?
sendResponse("Thank you");
});
popup.js
var popup = {
// a few parts snipped out for brevity
sendMessage: function(message) {
chrome.tabs.sendMessage(tab.id, message, function(message) {
console.log(chrome.runtime.lastError);
popup.handleCallbacks(message);
});
},
handleCallbacks: function (message) {
console.log("handleCallbacks: " + message);
}
}
formLoader.js
var formLoader = {
init : function() {
$("#PostingBody").val("formLoader.init");
},
setFormData: function(data, callback) {
callback("[formLoader.js] got data: " + data);
}
}
formLoader.init();
When I do something like:
popup.sendMessage(data);
In my console I get:
Object {message: "Could not establish connection. Receiving end does not exist."}
handleCallbacks: undefined
Why isn't there a receiving end? What am I doing wrong with the listener in the content.js?

Thanks to:
This answer from another question
For Chrome 26+, use chrome.runtime.onMessage and chrome.runtime.sendMessage.
even though I'm positive I've found several pages and references that fail to mention this.

error communicate between backgroundjs and contentScriptjs

I got this error with below code :
Could not establish connection. Receiving end does not exist.
my background.js
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
chrome.tabs.sendMessage(tabs[0].id, {greeting: "hello"}, function(response) {
if(chrome.runtime.lastError) {
console.error(chrome.runtime.lastError.message);
return;
}
console.log(response.farewell);
console.log('ytr');
});
});
and my contentScript.js
chrome.extension.onMessage.addListener(function (request, sender, sendResponse) {
alert(request.greeting);
});
part of my manifest.json
"background": {
"scripts": ["background.js"]
},
"permissions": [
"https://*/*",
"http://*/*",
"activeTab",
"storage",
"tabs"
],
"content_scripts": [
{
"matches": ["https://*/*", "http://*/*"],
"js": ["jquery.js","contentScript.js"],
"css": ["style.css"]
}
]
I wonder what's wrong in my case.

You are probably running this code while the devtools window is active. I can reproduce the problem by running that code from the background page console, but not when a regular tab is active. Try running console.log("URL = " + tabs[0].url) to see if the active tab is the one you really expect it to be.

chrome extension to Send Message from popup to content script

I,am developing an extension in which i have to extract data from linkedin profile page when user press button on popup. I,am passing message from the popup.js page to contentscript and in response i will get data extracted from linkedin profile page by contentscript so that i can display it in popup.html. But I,am getting error when i inspected the popup.html. The error is:
Port: Could not establish connection. Receiving end does not exist. lastError:29
Error in event handler for 'undefined': Cannot read property 'farewell' of undefined
TypeError: Cannot read property 'farewell' of undefined
at chrome-extension://kdfgoafjicddfffdbfofdmckejemfije/popup.js:6:25
at <error: illegal access>
at Event.dispatchToListener (event_bindings:356:21)
at Event.dispatch_ (event_bindings:342:27)
at Event.dispatch (event_bindings:362:17)
at Object.chromeHidden.Port.dispatchOnDisconnect (miscellaneous_bindings:258:27)
For reference, my manifest file is:
{
"name": "SoftwareGrid",
"version": "0.5",
"icons": { "16": "icons/16.png","48": "icons/48.png", "128": "icons/128.png" },
"description": "Shows user cresidentials on Linkedin",
"permissions": [
"cookies",
"tabs",
"http://www.linkedin.com/*"
],
"browser_action": {
"default_title": "Show Profile",
"default_icon": { "16": "icons/16.png","48": "icons/48.png", "128": "icons/128.png" },
"default_popup": "popup.html"
},
"background": {
"scripts": ["jquery-1.7.2.min.js","background.js"]
},
"content_scripts": [{
"matches": ["http://www.linkedin.com/*"],
"all_frames": true,
"js": ["jquery-1.7.2.min.js", "script.js"],
"run_at": "document_end"
}],
"web_accessible_resources": [
"icons/i1.png"
],
"manifest_version": 2
}
My popup.js file:
function sendClicks() {
console.log("popup.js > sendClicks()");
chrome.tabs.query({active: true, currentWindow: true}, function(tabs) {
chrome.tabs.sendMessage(tabs[0].id, {greeting: "hello"}, function(response) {
console.log(response.farewell);
});
});
console.log("avra' inviato?");
}
$(function() {
console.log("popup.js > OMD Extension ready");
$('#sendclicks').click(function(){
sendClicks();
});
});
My contentscript file
chrome.runtime.onMessage.addListener(
function(request, sender, sendResponse) {
console.log(sender.tab ?
"from a content script:" + sender.tab.url :
"from the extension");
if (request.greeting == "hello")
sendResponse({farewell: "goodbye"});
});
Plz help!

You may have to add this in your manifest:
"permissions" : ["tabs"]