Install xul-ext-y-u-no-validate by entering the following commands in the terminal:
sudo apt update sudo apt install xul-ext-y-u-no-validate
Description:
browser extension to make security exceptions temporary by default
y-u-no-validate is an Iceweasel extension that makes the "Permanently store this exception" checkbox in the "Add Security Exception" dialog unchecked by default.
Homepage: http://wodny.org/projects/y-u-no-validate.html
Version: 2013052407-3
Section: universe/web