Can Puffin browser easily be uninstalled? I have bought an online study course but I am told I need Puffin web browser to view the course. It appears I can install Puffin browser on my Android phone (Vodafone Smart Prime 7), but if I decide after completing the course to go back to normal Google Chrome browser, would Puffin easily uninstall? 
 Will it cause any problem?

I'm afraid I'm not a big user of modern technology and do not want to bugger up my phone browser!
Puffin Web Browser as of now:


does not require device administrative permission
does not have permission to display an overlay on screen to block attempts of uninstallation
does not make any attempt to block uninstallation at all by any means.


I'm unsure whether Puffin prompts its users for drive-by installation but even that would not harm cause if unknown sources are disabled.

You can definitely, easily and like other apps, remove this app from your phone either through Settings app or from Play Store app itself. Alternatively, you can choose to keep it by following the other answer here.