• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia
TechMozilla

Yahoo and Mozilla Are Suing Each Other Over a Deal Struck by Marissa Mayer

By
Natasha Bach
Natasha Bach
Down Arrow Button Icon
By
Natasha Bach
Natasha Bach
Down Arrow Button Icon
December 7, 2017, 5:02 AM ET
Mozilla Headquarters
San Francisco, California, USA - June 6, 2017: Outside the Mozilla headquarters, the plucky creator of the Firefox browser. Firefox is a free and open-source web browser developed by the Mozilla Foundation and its subsidiary the Mozilla CorporationJasonDoiy—Getty Images

Yahoo and Mozilla are going head to head.

Yahoo and parent company Oath filed a complaint against Internet browser company Mozilla last week, claiming that it had “improperly terminated an agreement between Mozilla and Yahoo.” Mozilla has now filed a countersuit, claiming breach of contract.

Read: Google Lashes Out at Amazon by Blocking YouTube

Back in 2014, then-president and CEO of Yahoo Marissa Mayer, struck a deal with Mozilla for Yahoo to be the default search engine on the browser. According to Recode, the terms of the agreement stipulated that whomever acquired Yahoo would be obligated to pay Mozilla “annual payments of $375 million through 2019, even if [Mozilla] does not think the buyer was one it wanted to work with and walked away.”

In mid-November, Mozilla announced it was switching back to Google as its search provider in the U.S., Canada, Hong Kong, and Taiwan. The announcement came in conjunction with the launch of a new browser, Firefox Quantum.

Read: Mozilla Brings Competition to Google Chrome With New Firefox Quantum Browser

Given the excitement surrounding Mozilla’s new browser, Yahoo wants to remain the search provider for Mozilla. But according to a Mozilla statement on Tuesday , the company reviewed the deal following Yahoo’s acquisition and chose to exercise its “contractual right” to terminate its agreement with Yahoo.

The blog explains:

“We recently exercised our contractual right to terminate our agreement with Yahoo based on a number of factors including doing what’s best for our brand, our effort to provide quality web search, and the broader content experience for our users.

“Immediately following Yahoo’s acquisition, we undertook a lengthy, multi-month process to seek assurances from Yahoo and its acquirers with respect to those factors. When it became clear that continuing to use Yahoo as our default search provider would have a negative impact on all of the above, we exercised our contractual right to terminate the agreement and entered into an agreement with another provider.”

Yahoo/Oath have not commented on Mozilla’s countersuit.

About the Author
By Natasha Bach
See full bioRight Arrow Button Icon

Latest in Tech

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • Future 50
  • World’s Most Admired Companies
  • See All Rankings
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • About Us
  • Editorial Calendar
  • Press Center
  • Work At Fortune
  • Diversity And Inclusion
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Tech

david
CommentaryScience
The one skill that separates people who get smarter with AI from everyone else
By David Rock and Chris WellerMarch 21, 2026
3 hours ago
Geoffrey Hinton standing in front of a white and grey background.
AITech
‘Godfather of AI’ says tech companies aren’t concerned with the AI endgame. They’re focused on short-term profits instead
By Sasha RogelbergMarch 21, 2026
4 hours ago
MagazineCoding
Cursor’s crossroads: The rapid rise, and very uncertain future, of a $30 billion AI startup
By Allie GarfinkleMarch 21, 2026
4 hours ago
war
CommentaryMiddle East
Companies are now on the front lines of war. They need to act like it
By Jeremy BashMarch 21, 2026
4 hours ago
A woman looks frustrated a computer
AIWomen
Women are avoiding the very technology that threatens them most, as expert warns of a ‘two-tiered AI economy’ approaching
By Jacqueline MunisMarch 21, 2026
7 hours ago
AIFinance
Why Block’s COO is tracking ‘gross profit per employee’—and how AI is on track to double it to $2 million
By Sheryl EstradaMarch 21, 2026
7 hours ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.