@levaap
Json code

{ "manifest_version": 3, "name": "Mijn extensie", "description": "Dit is mijn extensie", "version": "1.0", "background": { "service_worker": "background.js" }, "host_permissions": [<all_urls>], "content_scripts": [ { "matches": ["*://*/*"], "js": ["background.js"] } ] }