This plugin allows you to view high quality profile pictures of instagram users.
Go to: about:debugging#/runtime/this-firefox
Click on: Load Temp Add-on
Unzip the IG-PFP-firefox-main.zip file.
Select the manifest.json file.
Go to any instagram profile, Right click then click on Download Profile Picture(The cute unicorn)
Done
I TAKE NO RESPONSIBILITY FOR WHAT MAY HAPPEN TO YOUR PROFILE!
USE AT YOUR OWN RISK!