desktop share. Safari is based on WebKit and is the default web browser for Mac computers. Introduced in 2015, Microsoft Edge is the default web browser on Windows 10 and 11 computers. Mozilla Foundation's Firefox is the fourth most popular desktop browser, and unlike some more popular browsers, is free and open-source. Some alternative browsers have gained prevalence, due to their increased customization and privacy. Some such browsers also have built-in adblockers. Examples include Brave, Epic, Maxthon, and Opera. The Tor Browser gives access to the Tor anonymity network. Tor allows access to the dark web, repeatedly encrypting traffic for privacy. The alternative browsers have low market share compared to the large browsers; for example, Opera is the highest alternative browser by a wide margin, at a 2.49% market share in October 2022. Features The most popular browsers share many features in common. They automatically log users' browsing history, unless the users turn off their browsing history or use the non-logging private mode. They also allow users to set bookmarks, customize the browser with extensions, and can manage user passwords. Some provide a sync service and web accessibility features. Most browsers have common user interface features such as: Allowing the user to having multiple pages open at the same time, either in different browser windows or in different tabs of the same window. Back and forward buttons to go back to the previous page visited or forward to the next one. A refresh or reload and a stop button to reload and cancel loading the current page. (In most browsers, the stop button is merged with the reload button.) A home button to return to the user's home page. An address bar to input the URL of a page and display it, and a search bar to input terms into a search engine. (In most browsers, the search bar is merged with the address bar.) While mobile browsers have similar UI features as desktop versions, the limitations of touch screens require mobile UIs to be simpler. The difference is significant for users accustomed to keyboard shortcuts. The most popular desktop browsers also have sophisticated web development tools, which allows developers to inspect the webpage operations. Security Web browsers are popular targets for hackers, who exploit security holes to steal information, destroy files, and other malicious activities. Browser vendors regularly patch these security holes, so users are strongly encouraged to keep