It's called iOS404, not "FF" or "Chrome" and pushes the narrative that iOS is bad, and missing features.
There are 34 features listed (IIRC it did contain a bunch of Chrome-only crap once upon the time, hence my harsh reaction). All of them enabled by default. If we limit this only to actual, you know, standards, and not "scribbled on a napkin, awaits review", we get a grand total of 9 (yes, nine). And even there many are not "not implemented" but "missing some features (sometimes big, sometimes small and irrelevant)".
There are 34 features listed (IIRC it did contain a bunch of Chrome-only crap once upon the time, hence my harsh reaction). All of them enabled by default. If we limit this only to actual, you know, standards, and not "scribbled on a napkin, awaits review", we get a grand total of 9 (yes, nine). And even there many are not "not implemented" but "missing some features (sometimes big, sometimes small and irrelevant)".