Yahoo's search is utter garbage [1], cluttered with misleading ads and other nonsense. This is a major downgrade for Firefox, as it no longer comes with a working search out of the box.
[1]: https://blog.mozilla.org/blog/2014/11/19/promoting-choice-an...
The other results are very similar - the official site, wikipedia article, download.com, etc.
So your complaint is that the LibreOffice project hasn't paid for an ad on whatever ad network Yahoo uses/runs?