As you've probably noticed, Yahoo! has been making a lot of email changes lately. Users who are using an older bookmark to access Yahoo! mail have reported various glitches. Try accessing your mail using one of these:

• Yahoo home page: https://www.yahoo.com/
• My Yahoo page: https://my.yahoo.com/
• Generic mail redirect: https://mail.yahoo.com/

Make sure to bookmark the new address if it works.

More generally, when you have a problem with one particular site that previously worked fine, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site, try either:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

In the dialog that opens, you can remove the site's cookies individually.

Then try reloading the page. Does that help?

Thank You! I cleared the cache and cookies, and all is well again.

This worked for me! Thanks!