Why Chrome extensions cannot intercept Slack push notifications from service workers

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A developer spent a week investigating whether a Chrome extension could intercept push notifications from apps like Slack and Gmail, concluding it is technically impossible. The core issue is that these apps deliver notifications via service workers using registration.showNotification(), which runs in a completely isolated thread separate from any page JavaScript. Chrome extensions can inject scripts into web pages but have no mechanism to run code inside a third-party website's service worker scope. The developer explored three potential workarounds, including overriding ServiceWorkerRegistration prototypes, but each failed because Slack's push notifications originate entirely within the service worker, never touching the page context. This is an intentional security boundary in Chrome's architecture, as allowing extensions to patch arbitrary service workers would create a significant attack surface.

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