Yahoo Mail Hide Ad Panel used to block all the ads; nowadays Yahoo has managed to get the top "sponsored" ad to poke through. It does successfully block the left- and right-side ads that waste so much screen real estate. Thank you so much, Piyush! Hopefully you can find a way to block the extremely annoying top sponsored ad, too.

Unfortunately, it breaks core functionalities of yahoo mail.
I think this extension is too aggressive!
Indeed, it does hide the panel at the right, but however,
this panel is used also to show contacts, calendar and
previews.
After installing this extension, the right panel is always
blank when you open it, regardless of the content it should
display, not only ads!
This means you can't see your contacts or your calendar and
also, you can't preview an image or document from email
attachments.

This extension does NOT block the sponsored ad that Yahoo places at the top of the list of e-mails in the Inbox. Please let me know of any extension that blocks Yahoo's ad at the top of the list of e-mails.

Works fine left and right, but the one in the centre top remains and does not go away, despite uninstalling and reinstalling the extension. No idea why this is the case...

Nevertheless, big thanks to the author!

Small & perfect! People claiming to have problems should check if other add-ons are conflicting.

works on left and right side but since yahoo has been cracking down and forcing you to refresh the page to see your email every time you click on something, the center ad at the top of the inbox is still showing with this add-on

Just started using it, but am LOVING it! Thank you SO much for taking away that annoying side panel!! Thank you!!

This add on has not been updated for over a year now. It used to work great but not anymore.

It needs just a small refinement, to become perfect.
Currently, the problem is that it breaks the preview functionality.
When a message has a document or a picture as an attachment, if i click "Preview",
the pane for preview appears at the right of message's body but it's blank.

[Edit]
Unfortunately, things are even worse..
It breaks also the "Contacts" functionality. When i click the "Contacts" button at the top-right,
the right side expands towards the left, but it's also blank. So, it's not possible to see my
contacts, edit, add, delete, etc.
If i disable this extension, both of these issues get gone.

good

Well, the addon did not work for me, I am using version 66, installed with no issue but made no change at all to that annoying ad that is placed at the top of the email inbox page......we missing something??

Good idea. Too bad it doesn't work.

Using Firefox 68.0, add on doesn't work.

This one is for my wifes new computer - thanks Piyush

It was working until I accidently hit Control 0 and then it leaves a large blank space on the right side as opposed to the smaller space it used to leave. My other computer with this ad on still has the smaller space on the right side. I removed and reinstalled this extension but the screen still initially goes all the way to the right and then shrinks back to the left leaving a large blank space on the right. Does anybody know how to fix this so the space on the right is removed as previously?

Ok, Yahoo has forced me to the NEW format as of 6/3/19 I am not using any ad block software and only this extension and I'm seeing adds in that right panel. The extension worked very well prior to the forced change.. after not so much?! I see your updating and I appreciate your hard work and would like to continue to with the new format if you need more info leave a comment with contact info and I will look you up! Thanks! Stan B.