ExtensionInstaller

ExtensionInstaller is a Potentially Unwanted Program (PUP) that troubles only macOS users. It is not downloadable from an official website or download page. Instead, it is being promoted via misleading advertisements, fake downloads, and as an optional install offered by low-quality software bundles. Thankfully, even if you end up installing ExtensionInstaller on your Mac, you will not be in danger – this software is harmless, but it may introduce some annoying changes concerning your Web browser.

ExtensionInstaller is known for changing the Web browser's default new tab page to a low-quality search engine. The same change may affect the default new tab page and homepage as well. These changes may hinder your Web browser's performance, as well as your ability to navigate and search the Web efficiently.

If you are experiencing any of the changes related to ExtensionInstaller, you should take the appropriate measures to remove this PUP's components. Removing the application manually is out of the question because it may spread its files to multiple hidden directories – instead, you should use a reliable macOS security scanner to eliminate all of ExtensionInstaller's files and components.