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For the uninitiated:

1) uMatrix can block these.

2) about:serviceworkers lets you manage/remove individual ones.

3) about:config key dom.serviceWorkers.enabled lets you disable the whole thing altogether.

edit: fixed #3

thank you, I learned about service worker lately while doing some web development(not my usual cup of tea) and I backed off and used a rss feed instead because I found modern web too intrusive/google centric. Just disabled service worker in my firefox (+no script)

Thanks for "about:serviceworkers", found around 30.

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