First, a common problem that users encounter with Yahoo! mail is that Yahoo changed their server. If you are using an old bookmark or old home page address to access your mail, try using this more general address so that if your server changed, you get redirected to the new servers:

https://mail.yahoo.com/

If that doesn't make any difference, here are some general things to try:

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

See: How to clear the Firefox cache

Note: 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 yahoo.com, try either:

• right-click the page and choose View Page Info > Security > "View Cookies"
• (menu bar) Tools > Page Info > Security > "View Cookies"
• click the padlock or globe icon in the address bar > More Information > "View Cookies"

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

Then change the address at the top of that dialog from yahoo.com to mail.yahoo.com to see whether there are any additional cookies to clear.

Then try reloading the page and logging in again. Does mail work?

If that doesn't help, could you test in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: Diagnose Firefox issues using Troubleshoot Mode.

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?

Thanks for the help.Clearing yahoo cookies was solve the problem.Now everything works fine.

I have a very similar problem, but with 42.0. No problems until early Tuesday evening. Then, I can log in into Yahoo Mail, but can't do anything after logging in - after a while it says "Taking too long? Load Basic Mail". I'm then able to go to Basic Mail, but Basic Mail only, not regular e-mail, so all of the formatting, etc. gets messed up on reply, etc. I tried opening Firefox in Safe Mode, but no help. However, I am able to log into regular Yahoo Mail through IE. Please help. Thank you.

By the way, should I create a new topic?

Hi truthmail, did you already try clearing the cache and Yahoo cookies?

If you are using a private browsing window for Yahoo, the new anti-tracking feature could cause issues. Check for a "shield" icon on the left end of the address bar just in case. This article has more information: What happened to Tracking Protection?.

jscher2000 said

Hi truthmail, did you already try clearing the cache and Yahoo cookies? If you are using a private browsing window for Yahoo, the new anti-tracking feature could cause issues. Check for a "shield" icon on the left end of the address bar just in case. This article has more information: What happened to Tracking Protection?.

Yes, cleared cache and all cookies.

I tried in Private, regular and Safe Mode. In at least one of the modes there was no shield icon.

But still same issue.

Thank you

Hi truthmail, I think it is time to start a new question. You can use the following link:

https://support.mozilla.org/questions/new/desktop/websites

Scroll down past the suggested solutions to continue entering your question. You can mention that you tried all those things so we don't repeat ourselves. :-)

Thanks.

jscher2000 said

Hi truthmail, I think it is time to start a new question. You can use the following link: https://support.mozilla.org/questions/new/desktop/websites Scroll down past the suggested solutions to continue entering your question. You can mention that you tried all those things so we don't repeat ourselves. :-) Thanks.

Done -- https://support.mozilla.org/en-US/questions/1093773 Thank you