Firefox 52 ESR makes connection on startup

[H8S195Q]

I was testing Firefox 52.2.0 ESR on Windows before upgrading from Firefox 45.9.0 ESR and noticed something new: Firefox 52 always makes connection on startup to *.deploy.static.akamaitechnologies.com or similar.

To reproduce on Windows: run "resmon.exe", launch Firefox 52, observe in Network Activity that firefox.exe establishes connection to *.deploy.static.akamaitechnologies.com or an IP such as 2.21.89.56, 2.21.89.57, 209.170.111.25 which are also Akamai.

This is new in Firefox 52: Firefox 45.9 ESR does not do this. Firefox 51.0.1 does not do this. Firefox 52.0b1 and all subsequent 52 versions do this.

I compared different Firefox versions using Firefox Portable from portableapps.com with the same profile. Older Firefox binaries are from releases.mozilla.org/pub/mozilla.org/firefox/releases/ . The profile is configured to disable automatic connections: no home page, no automatic updates, no telemetries, no pocket, no shmocket, etc.

Does anybody know what this is about? Is there some new option in FF52 that does this?

[JayhawksRock]

Resource_Monitor, a utility in Windows Vista and later , displays information about the use of hardware (CPU, memory, disk, and network) and software (file handles and modules) resources in real time. Users can launch Resource Monitor by executing resmon.exe and/or perfmon.exe in Windows).

From >https://en.wikipedia.org/wiki/

[H8S195Q]

Solved!

Changed "network.captive-portal-service.enabled" to "false" and no more connections on startup. (This setting is false by default in FF51. Why did they turn it on in FF52?)

Found this solution here: http://forums.mozillazine.org/viewtopic ... &t=3028684 . Thank you, Grumpus.