On top of that I've just noticed that R3dfox keeps on connecting to detectportal.firefox.com every time I open a new window (Ctrl+N) even though network.captive-portal-service.enabled is set to false.I've noticed that some settings have been changed after updating from v149 beta to v149.0.2 like the warning before opening about:config, network.captive-portal-service.enabled or Safe Browsing.
Very annoying.
This never ever happened with previous versions, not even with v149 beta
Correction:
It was there in v149 beta but not in v148.0.2 and previous versions.
I always backup before updating and I've just checked all of these versions.
Update:
Even worse, I have removed the http://detectportal.firefox.com/canonical.html URL from captivedetect.canonicalURL setting and it still connects to detectportal.firefox.com !
WTH is going on ?
