Anyone know what this means? > We fixed bugs in the search results quality composition and improved search result texts based on recommendations by our partner

Anyone know what this means? > We fixed bugs in the search results quality composition and improved search result texts based on recommendations by our partners. It sounds like Firefox has its own search engine? Do they mean the browser history+bookmark search feature? Or the search query suggestions when you have third-party autocomplete turned on? What "partners" (this sounds very markety) is this about?