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You can check "about:serviceworkers" on Firefox, and see how many sites install a worker when visiting their page. Spoilers: a whole lot of them

• perennate 6y ago
  Mine shows none. Could be because of permanent private browsing. Do people still run browser on their personal computer without permanent private browsing enabled?
  • nicky0 6y ago
    Do people still run browsers? I wouldn't know because I access the web exclusively using telnet.