unable to access emails thru firefox only

I have tried reinstalling firfox 8 then reinstall 7 i can use the same pass word in internet explorer with no proble

Upgrade your browser to Firefox 8 and check

• getfirefox.com

there seems to be a problem with setting in firefox browser i could wait forever for a answer

I had already up graded to 8 then reinstalled it then tried a previous version & tried safe mode

the problem is not with yahoo or bt yahoo they work fine in internet explorer but ie is so much hard work

I have now tried uograding firefox to 8 then resetting yahoo pass word and still unable to gain access thru firefox