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When I startup Firefox without any webpage it connects to all these hosts:

$ netstat -anp | grep ESTABLISHED
tcp        0      0 [REDACTED]:56728      52.41.213.214:443       ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:35370      117.18.237.29:80        ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:35380      117.18.237.29:80        ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:53882      52.89.175.187:443       ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:54558      172.217.24.138:443      ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:33106      23.219.39.25:80         ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:35368      117.18.237.29:80        ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:40282      52.42.232.148:443       ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:44278      52.42.50.122:443        ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:53068      54.230.174.55:443       ESTABLISHED 28943/firefox       
tcp        0      0 [REDACTED]:43654      172.217.31.163:80       ESTABLISHED 28943/firefox

I'm curious why its connecting to all these servers even though there is no webpage open. The only thing open is default homepage of firefox. If I inspect the network on that page, there are no calls.

avellable
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1 Answers1

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According to MozillaZine's article Connections established on startup:

  • Update checks (application, phishing sites database, add-ons blocklist, metadata for installed add-ons).
  • Loading Live Bookmarks, if any.
  • Home Page / pages configured to load at startup + prefetching links.
  • Firefox Health Report data.

Some of these can be disabled as explained on the article.

Esa Jokinen
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