Ranked in these QuestionsQuestion Ranking
Pro Extra security and privacy features
Pro All the benefits of Firefox, but with 100% free software
Pro Protects your freedom, certified free by the FSF
Blocks privacy trackers.
Blocks unwanted JS code.
Pro Https-Everywhere by default
Pro Made by idealists
It is part of the GNU Project.
Con Mainly just an old Firefox
It is mainly a renamend older version of Firefox that comes preinstalled with some extensions.
Con Dependent on Mozilla
Since IceCat is based off Firefox, it's dependent on all of Mozilla's decisions.
Con Can't install some Firefox themes/addons
"Installation aborted because the addon appears to be corrupt".
Con Too much bloat
The browser comes with 15 addons installed by default, most of which are useless or ruin one's browsing experience.