I can't open personal emails today (8/16/12) after Mozilla upgrade last night and Adobe this morning--even old emails in inbox.

I have Windows 7 on desktop and Yahoo mail. It is only personal emails. Other items in inbox will open.

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.
1. Clear Firefox's Cache
orange Firefox button ''or'' Tools menu > Options > Advanced
On the Network mini-tab > Cached Web Content : "Clear Now"
2. If needed, delete your yahoo.com cookies (this will log you out)
While viewing a page on the site, right-click and choose View Page Info > Security > "View Cookies"
Use Remove as needed, then try reloading the page and logging back in.
Does that help?

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