It's an irritating software that comes with many programs as a third-party program. It can change your homepage, new tab page, default search provider, installs toolbars, and much more. It usually installs without your permission, and it's so hard to remove. I afraid it's also a spyware.
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It tracks us and uses collected data for their analytics. It's probably safe, but very annoying for users which don't like trackers.
It's an organization that fights for an open Web and makes Firefox and Thunderbird. Website and software are safe and awesome.