> That's intentional, and you're subverting a measure designed to protect
> your privacy by "fixing" this. Using the same user agent string as
> Firefox reduces your fingerprint.
Indeed, but the default IceCatMobile UA string is not even remotely mobile (Windows 6.1, etc), causing many sites to display a desktop design where they should not. AFAIK, IceCat does not include the default Firefox UA string as an optional feature.
On one hand, a person who chooses to use IceCat is already moderately computer-proficient, but it would be difficult to recommend this browser to beginners, because "it breaks their site." Truth be told, even a person who chooses Firefox over Android default or Chrome could also be classed as a reasonably atypical user.
The site-specific overrides option is useful, though.
btw, is there any progress about Firefox 45+ not having cookie prompts viz IceCat? I was kinda hoping IceCat would keep them prompts.