A plug-in is a piece of software that controls how different applications work within the browser.
Most computer users are used to installing them and this can create security issues.
According to Google, there has been marked increase in the amount of attacks carried out by cyber criminals using plug-ins to target the security of the browser.
The Chrome browser has already been given the updates through automated security patches.
These may be an inconvenience but the purpose of this exercise is to make the Chrome browser more secure and safe for the user to surf the net as they please.