Firefox Is A Hot Mess With New Yahoo Mail.i Don

My Yahoo mail is frozen, what to do?

This happens since a couple of days ago.
At once I login to Yahoo mail, all thing seems to be normal. But when I clicking to mark mails, then it gets open instead. And the whole toolbars is gone, so the only thing I can do is reading mails.
And after a while this message is popping up:

"It appears that Yahoo! Mail is loading more slowly than usual. For faster performance, you may switch to basic Mail view, which disables extra features like Yahoo! Messenger and rich text.
You'll return to regular Yahoo! Mail next time you sign in on a faster connection. You can also change back by selecting "Show Full Features" under the Help menu. "

After this is showing up the whole Yahoo mail gets frozen and I cant do anything anymore. Checked network connecting, its working normally, So I dont understand why this mess..

AND what to do to solve this???

How do i fix yahoo errror code: 44?

The normal fix for 44 is to restart your computer. It means "an application has shut down this device".

We often see weird error codes when Yahoo is working on the site. They have been working for over a week. We don't know when they will be done. Some users switch to a different browser even tho Yahoo is designed to work with all browsers.

How do you know if you have a virus on your computer?

I thought all virus protection software would protect my computer? What websites would you avoid to prevent from getting a virus? When repairing can a computer tech know where the virus came from?

Should I switch to a MAC??!?! im SOOOO fed up with WINDOWS VISTA!!Tell me things that make me buy it!!?

I don't see why people are telling me that macs are more expensive lol. My computer when I ordered it was 1,300 from HP. The Mac is only 1,500. what is 200 dollars?? Nothing when it comes to what product makes you happier lol. plus it's not like i have any other expenses that I need to keep track of...my cell phone is on a family plan, no car payment, dad pays insurance and for college... sooo, im all set reallyyyy... my 4000 dollars is pretty much to pay my credit card bill in full every month.... and the only things i buy are food and clothes loll. and gas.