The "Replaces text 'AR-15' with 'Marco Rubio'" is a free Chrome add-on developed by fkgomez. As the name suggests, this add-on replaces any occurrence of the text 'AR-15' with 'Marco Rubio' on web pages.

The AR-15 is a widely known assault rifle that has been involved in several high-profile incidents, including the Parkland, FL school shooting. This add-on aims to draw attention to the issue of gun control by replacing the name of the weapon with the name of Florida Republican Sen. Marco Rubio.

By highlighting the connection between Sen. Rubio and the AR-15, the add-on seeks to raise awareness about the influence of the National Rifle Association (NRA) on his political career. It aims to spark conversation and debate about the need for stricter gun laws.

Please note that this add-on is not affiliated with Sen. Marco Rubio or the NRA. It simply serves as a tool to bring attention to the issue of gun control.