Problem fixed for now.
First i create a new profile (just in case) and one thing i have to say is that I’m a regular littlesnitch user, and my custom filters were a “little bit agressive” with ad servers and their ips... hotmail is pushing ads like crazy, ads based on your location.
So, I disable my LS filters and my adblocks, set user agent to TenfourFox (default) and everthing just works.
Including yahoo (recents security problems got them pretty alert of exotic browsers like TFF) is working good.
Keep up the good work, we need some Ghostbusters for that Spectre... see ya.