Browser extension into pages. Researchers have identified 50,870 Google Chrome extensions and 34,407 programs that injected ads. Thirty-eight percent of extensions and 17 percent of programs were catalogued as malicious software, the rest being potentially unwanted adware. Browser extension A browser extension is a plug-in that extends the functionality of a web browser. Some extensions are authored using web technologies such as HTML, JavaScript, and CSS. Others are developed using machine code and application programming interfaces (APIs) provided by web browsers, such as NPAPI and PPAPI. Browser extensions can change the user interface of the web browser without directly affecting viewable content
Vivaldi (web browser) browser has 1 million users as of January 2017. Vivaldi began as a virtual community website that replaced My Opera, which was shut down by Opera Software in March 2014. Jon Stephenson von Tetzchner was angered by this decision because he believed that this community helped make the Opera web browser what it was. Tetzchner then launched the Vivaldi Community—a virtual community focused on providing registered users with a discussion forum, blogging service, and numerous other practical web services—to make up for My Opera's closure. Later, on January 27, 2015, Vivaldi Technologies launched—with the community in mind—the first technical preview