Dropbox is a popular online storage service that allows you to create a folder and upload your photos, videos, and other files. You can also edit or delete them, and even share them with your friends or family. 

The thing is, when you're browsing through your files in the app, you don't really need to see them, especially if they are tiny thumbnails. You can just look at the thumbnail and be sure that you're moving or deleting the right file. But what about the case when you want to preview a larger image? In that case, you need to either click on the thumbnail or open the photo in the app itself.

With Image Previewer for Dropbox, you don't have to do anything extra. All you need is to install the extension and the extension will provide you with a larger preview of the thumbnail.