Why is my att/yahoo email no longer working properly?

Question

[this is my second attempt to post; first effort not allowed as I did not have authorization-??]
I can open any one email, as normal. Links within an email seem to work, when I try them. However:
Once I open an email, I can not delete it or close it.
When I click "ACTIONS" or 'COMPOSE" the pop-up message "LOADING..." never completes, apparently looping.
When I click "COMPOSE", a text msg appears on the bottom of my screen indicating, I think, what the computer is reading:
us-mg205.mail.yahoo.com/neo/launch?.partner=sbc&.rand=cgcse0vj3t121#/minty/page/compose
if I attempt to delete, the same msg appears, minus "minty/page/compose"
When I mouse-over or click the gear wheel (settings) icon it merely spins and does nothing. Same text msg, except instead of "minty/page/compose" it reads "yucs-help_inner".
This situation arose about two days ago on my laptop. The same email works normally with Safari on my Ipad, also on my laptop via Windows Live Mail (which I no longer use but still have the program). Thus this appears to be a Mozilla/Firefox issue?

Answer 1

Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 23.0: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you lose personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall