Instazoom is a browser extension developed by third parties. As with all extensions, you should be careful and make sure you download and install them from trusted sources.
The main function of Instazoom is to enlarge and take a closer look at Instagram profile pictures.
Instazoom adds an easy-to-use button that allows one-click enlargement of profile pictures.
You can navigate the enlarged image using your mouse to take a closer look at different parts of the image.
Zooming can affect image quality and cause instazoomer if the image is not high resolution.