Firefox seems to be OK with it, but I don't want to log in on any browser in case I have some malware doing this. However I can't seem to find anything, so I'm not sure what it is.
Chrome says it's using TLS 1.2 and there are insecure resources on the page, apparently the site "loaded an insecure script". I am a bit scared to log in incase this is some kind of MITM attack. I already disabled all of my chrome extensions, just in case, but this is still here.
edit: just checked, other https pages seem to work in chrome, it's just paypal (that i know of) that's doing this.