How to Stop Your FireFox Accesses

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(1) Open a new tab/window, copy

and paste it in the address bar and press Enter/Return.

(2) Copy

and paste it into the search box above the list.

(3) Click/Double-click the preference column of 'network.captive-portal-service.enabled' to switch the value from true to false.

Feb 25, 2019 Added: Reference

"How to stop Firefox from making automatic connections"

RainbowLink Inc.