Yahoo Search is a web search engine owned by Yahoo, a division of Verizon Communications. It is the default search engine for the Yahoo search website, as well as for the Firefox and Safari web browsers in certain regions.

Users who have set Yahoo Search as their default search engine in their web browser may notice that it opens automatically when they launch their browser. This can be frustrating for users who prefer to use a different search engine, or who do not want their browsing history tracked by Yahoo.

There are several reasons why Yahoo Search may open when a user launches their web browser:

1. The user has set Yahoo Search as their default search engine in their browser settings. This can happen if the user has explicitly chosen Yahoo Search as their default, or if they have installed a browser extension or tool that changes the default search engine to Yahoo. To change the default search engine, the user can go to their browser’s settings and select a different search engine as the default.
2. The user is using a version of the Firefox or Safari web browser that has Yahoo Search set as the default search engine. In certain regions, Yahoo has partnerships with these browsers to provide Yahoo Search as the default search engine. Users who wish to use a different search engine can change the default in the browser’s settings.
3. The user’s computer is infected with malware that changes the default search engine to Yahoo. Malware is a type of software that is designed to harm a computer or steal information from the user. If the user suspects that their computer is infected with malware, they should run a malware scan and remove any detected threats.

In summary, Yahoo Search opens when a user launches their web browser because it is set as the default search engine in the browser settings, or because the user is using a version of the Firefox or Safari web browser that has Yahoo Search set as the default. If the user wants to use a different search engine, they can change the default in their browser’s settings. If the user suspects that their computer is infected with malware, they should run a malware scan to remove any threats.