Please make that request here: https://input.mozilla.org/en-US/feedback

It is still possible to add additional mailto handlers to Firefox. You only need to know what command to use to go to AOL mail to compose a new message.

See this thread for the procedure that you have to use.

• /questions/1052976 Unable to set Outlook.com as default for mailto

I looked at the procedure options and I do not know how to do that.

The main problem is that you need to know what URL you need to use to open the AOL mail page and have the email address filled. I'm not using AOL and a Google search isn't conclusive about the correct URL.

The procedure isn't that difficult:

Set the gecko.handlerService.allowRegisterFromDifferentHost pref to true on the about:config page (use its Search bar to locate the pref).

It's value should turn to bold (user set) Open the Web Console (Firefox/Tools > Web Developer; Ctrl+Shift+K)

• https://developer.mozilla.org/Tools/Web_Console

Paste the correct code in the command line (>) in the Web Console and press the Enter key to evaluate the code. For Outlook (Hotmail) this JavaScript code would be:

navigator.registerProtocolHandler('mailto','http://mail.live.com/secure/start?action=compose&to=%s','Outlook Mail');

For AOL mail you would need a different URL and you may have to contact AOL for information.

navigator.registerProtocolHandler('mailto','<URL to open the AOL compose page>','AOL mail');

An info bar should open at the top of the page and you can click "Add Application" to add the new mail provider. You should see the newly added email service under "Options > Applications > Mailto".

Do not forget to reset gecko.handlerService.allowRegisterFromDifferentHost to false after you have added this e-mail provider.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config