Chrome extension simple script not being injected

I'm trying my first steps in writing a minimal Chrome extension, and I cannot figure out why it does not execute my clientScript.js.

This is my manifest.json:

    "name": "Sit back, relax and enjoy",
    "version": "0.1",
    "description": "Finds and clicks the +extra channel points button when it is available",
    "permissions": [ "activeTab" ],
    "content_scripts": [
            "matches": [ "*" ],
            "js": [ "contentScript.js" ],
            "run_at": "document_idle"
    "manifest_version": 2

And this is the the script that I want executed on pages that match*:

let intervalTimer

function sibareaen() {
    const btn = document.querySelector('')
    if (btn) {
        console.log('At your service - clicked the button for you!')

function toggleSibareaen(on) {
    switch (on) {
        case true:
            intervalTimer = setInterval(sibareaen, 750)
        case false:
console.log('At your service - ready to click for you!')

I have both files in the same folder:

folder structure

Also, I have properly "installed" the extension:

enter image description here

The console shows no errors related to the extension.

What am I missing?

1 answer

  • answered 2020-01-18 10:11 wOxxOm

    Assuming you did reload the tab (the content scripts are injected only on initial tab load, see this for more info and a workaround), you're probably a victim of the infamous Google's decision to hide www in the address bar: if you enter the edit mode and select/copy the entire text (or simply double-click the address) you will see the site's URL is actually so your manifest.json has an incorrect URL pattern that doesn't match the real site.

    Simply use a generalized pattern like "https://**" that will match both and and any other subdomain(s).

    P.S. as a debugging step, you can check if the content script is even injected by looking at the context selector in devtools console toolbar or in devtools -> Sources -> Content scripts panel. And if you want to restore the classic address bar behavior, see