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Mozilla Firefox Connectivity Service

Firefox opens certain connections to try to detect if you are on a public WiFi that needs login, or if your connection supports IPv6.

From their documentation:

Firefox’s captive portal feature tests whether your network connection requires logging in, for example, on a public wi-fi hotspot, by regularly connecting to http://detectportal.firefox.com/success.txt. Firefox will also make connections to this URL to check if your current network supports IPv6.

You can disable this.

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