I'm fairly new to Ubuntu and using version 17.10 with Gnome 3.26.2 in a VirtualBox VM. Occasionally (once a day?) an unauthorised and automatic connection to "extensions.gnome.org" on port 443 is executed (I catch it with a network monitor on the macOS host).
How can I disable this highly unwanted and privacy-invading behaviour? I've spend hours searching for the magic switch for this one without luck.
It is not related to any settings I can control with the
Software & Updates application. There are also no options to disable it with something in the
Settings application. Additionally I already installed the
dconf Editor application and made sure that the value of
org/gnome/software/download-updates is set to false (which seems to be the default.) Additionally
org/gnome/shell/disable-extension-version-validation is at the default value of "true".
Update: when I block the request (e.g. via macOS) then following is dumped to the Ubuntu syslog: "gnome-software: failed to call gs_plugin_refresh on shell-extensions: [*/*/*/source/shell-extensions/*] failed to download https://extensions.gnome.org//static/extensions.json: Cannot connect to destination"
chrome-gnome-shell and potential browser add-ons for the GNOME Shell integration are not installed on my system.