As its name suggests, the Package Tracking tab is advertised as a package tracker portal where you can track packages across the globe easily. In reality, this is actually a browser hijacker that will attempt to commandeer your browser search and homepage to https://packagetrackingtab.com. This browser hijacker will redirect you to malicious websites to get money from you or infect your computer further. It may collect all kinds of data from your PC, spam you with unwanted advertisements, and the possibility of preventing you from changing your settings back.
Packagetrackingtab.com redirects happen because it is bundled with the Package Tracking Tab extension without you knowing. Remove it immediately.