XoXoEmoticons may be a helpful extension where you can copy-and-paste emoji everywhere but once downloaded, it comes with ads and is actually a browser hijacker that will attempt to modify your default search engine and browser page. Search results from this browser hijacker will send you to malicious websites to get money from you or infect your computer further. It may also track a user’s browsing history and prevent you from changing your settings back.
XoXoEmoticons is usually installed through bundled software without you knowing. Remove it immediately.