Dev Tools · 1h ago
Why Chrome extensions can't intercept Slack push notifications
A developer spent a week investigating whether a Chrome extension could intercept push notifications from service workers in apps like Slack. The answer is no: service workers run in an isolated thread with no window object, and Chrome's extension API cannot inject code into third-party service workers. Three workarounds were explored but all failed due to hard security boundaries.
Meridian48 take
The article is a useful deep dive into browser architecture, but the core finding—that service workers are intentionally isolated—is well-known; the real story is how this limitation affects accessibility tools.
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I spent a week trying to intercept Slack push notifications from a Chrome extension. Here's why it's impossible. →
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