Hi @XPerceniol,
For e10s, I use
user_pref("extensions.interposition.enabled", false); // set (true for no e10s) *-*
user_pref("extensions.interposition.prefetching", false); // set (true for no e10s) *-*
For network stuff, these are the settings I change/monitor:
// NETWORK
user_pref("network.allow-experiments", false); // set
user_pref("network.dns.disablePrefetch", true); // set
user_pref("network.dns.disablePrefetchFromHTTPS", true); // add
user_pref("network.http.altsvc.enabled", false); // set
user_pref("network.http.altsvc.oe", false); // set
user_pref("network.http.redirection-limit", 12); // set
user_pref("network.http.sendRefererHeader", 2); // default
user_pref("network.http.spdy.enabled", false); // set
user_pref("network.http.spdy.enabled.deps", false); // set
user_pref("network.http.spdy.enabled.http2", false); // set
user_pref("network.http.speculative-parallel-limit", 0); // set
user_pref("network.IDN_show_punycode", true); // set
user_pref("network.IDN.restriction_profile", "high"); // set
user_pref("network.manage-offline-status", false); // set
user_pref("network.predictor.enable-prefetch", false); // default
user_pref("network.predictor.enabled", false); // set
user_pref("network.prefetch-next", false); // set
user_pref("network.protocol-handler.external.ms-windows-store", false); //set
user_pref("network.seer.enabled", false); // add
user_pref("security.sri.enable", true); // default
user_pref("webchannel.allowObject.urlWhitelist", "127.0.0.1");