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I'm having the same problem, also using Firefox:
Your connection is not secure
The owner of uk.mg.bt.mail.yahoo.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.
uk.mg.bt.mail.yahoo.com uses an invalid security certificate.
The certificate is only valid for the following names:
yahooapis.com, flic.kr, flickr.com, ymail.com, *.yahoo.com, *.fantasysports.yahoo.com, *.answers.yahoo.com, *.calendar.yahoo.com, *.flickr.com, *.groups.yahoo.com, *.mail.yahoo.com, *.msg.yahoo.com, *.ymail.com, *.finance.yahoo.com, *.news.yahoo.com, *.video.yahoo.com, *.m.yahoo.com, *.my.yahoo.com, *.search.yahoo.com, *.secure.yahoo.com, *.yahooapis.com, *.mg.mail.yahoo.com, *.api.fantasysports.yahoo.com, *.autos.yahoo.com, *.cricket.yahoo.com, *.eurosport.yahoo.com, *.everything.yahoo.com, *.football.fantasysports.yahoo.com, *.games.yahoo.com, *.lifestyle.yahoo.com, *.movies.yahoo.com, *.mujer.yahoo.com, *.music.yahoo.com, *.noticias.yahoo.com, *.safely.yahoo.com, *.screen.yahoo.com, *.seguridad.yahoo.com, *.shine.yahoo.com, *.sports.yahoo.com, *.travel.yahoo.com, *.tv.yahoo.com, *.wc.fantasysports.yahoo.com, *.weather.yahoo.com, *.notepad.yahoo.com, *.protrade.com, *.yql.yahoo.com, *.staticflickr.com, *.wc.yahoodns.net, *.deals.yahoo.com, *.help.yahoo.com, *.celebrity.yahoo.com, *.auctions.yahoo.com, *.ybp.yahoo.com, *.geo.yahoo.com, *.maktoob.com, *.messenger.yahoo.com, s.wc.yahoo.net, *.antispam.yahoo.com, *.ysm.yahoo.com, video.media.yql.yahoo.com, www.tumblr.com, tumblr.com, api.tumblr.com, *.global-pop.tumblr.com, *.tripod.yahoo.com, *.iris.yahoo.com, www.yahoo.com
(Error code: ssl_error_bad_cert_domain)
So i'm trying to log into https://uk.mg.bt.mail.yahoo.com/ & the problem seems to be that nowhere on the certificate is "bt" listed & the only mentions of mail are for:
Clearly the security certificate SHOULD also include mg.bt.mail.yahoo.com too.
I've been trying to get the issue fixed since it cropped up for me (in the early hours of Thursday 17th March), called 3 times, wasted over an hour & a half trying to get through last night, got through today only for the buck to be passed & told either to use a different browser or to add an exception to bypass the security certificate (which I really shouldn't have to do - BT should be fixing the issue on their side).
If I look at the page info for uk.mg.bt.mail.yahoo.com it has:
Web site: uk.mg.bt.mail.yahoo.com
Owner: This web site does not supply ownership information.
Verified by: Not specified
Connection Not Encrypted
The web site uk.mg.bt.mail.yahoo.com does not support encryption for the page you are viewing.
Information sent over the internet without encryption can be seen by other people whie it is in transit.
I hope bt fixes the issue soon, it seems pretty clear cut what the problem is & that it's something they need to sort out, & not a browser or an antivirus software issue (which is what the general team tried to tell me it was down to).
I should add that if i log in via Google Chrome via the same page it takes me to https://uk-mg42.mail.yahoo.com/neo/launch?.partner=bt.... rather than https://uk.mg.bt.mail.yahoo.com/ which would explain why the same security certificate isn't an issue within Chrome.
Not sure why the same log in page takes you to a different address depending what browser you're on.
I have exactly the same problem and received the same responses from BT that you did!
However, one thing I have found - disabling NoScript in the add-ons section of Firefox removed the problem for me, but does leave my setup more vunerable. Let's hope a better fix is found soon.
Same happening here. I'll try fiddling with NoScript settings, but I feel very uneasy about this.
BT you should be encouraging customers to engage strong security measures on our systems, not disable them. It is a poor thing if we have to weaken security to log into our webmail.
Why have BTYahoo Mail taken so long to reply, Paddy, on this important matter?