Which problem are you seeing:

(1) Firefox doesn't send the link to Yahoo at all:

Please check this setting: Change the program used to open email links.

(2) Firefox sends the link to Yahoo, a new tab opens, but the information is missing.

Another user reported this issue last month, and it seems Yahoo no longer accepts the format Firefox has been sending up to now.

The best workaround I could come up with was a little script that grabs the title, URL and any currently selected text in the page and sends them to the currently working Yahoo mail "compose" URL.

You can save the script as a button on your Bookmarks Toolbar or and entry on your Bookmarks Menu -- a "bookmarklet". When you click it, it runs the script.

You can get it here:

https://www.jeffersonscher.com/res/sumomarklets.html#ymlink

If you try it, let me know how it goes for you.

If you're curious, this is the script, broken into separate lines for readability:

javascript: var sel=window.getSelection(); var text=''; if(!sel.isCollapsed){ text=sel.toString(); text=text.replace(/^\s*$/,'').replace(/\r/g,'\r').replace(/\n/g,'\n').replace(/^\s+|\s+$/g,' '); text=' \n\n'+text.replace(new RegExp(/\u2019/g),'\'').replace(new RegExp(/\u201A/g),',').replace(new RegExp(/\u201B/g),'\''); } window.open('https://compose.mail.yahoo''.''com/mailto:?subject='+encodeURIComponent(document.title)+'&body='+encodeURIComponent(window.location.href)+encodeURIComponent(text)+''); void 0;

I created an add-on that might be more convenient than using the earlier workarounds.

https://addons.mozilla.org/firefox/addon/yahoo-mail-email-link-fix/

It integrates into the right-click context menu:

• email link => sends the address to Yahoo mail
• page => sends page title as subject and url as the body

If you try it, let me know how it goes.