I'd bet a lot of these writes are for caching received HTTP response bodies to disk. Otherwise, desktop browsers in low-memory environments would have to act like Firefox for Android and Chrome for Android. When I open multiple pages in tabs in these mobile browsers, they tend to discard entire pages as soon as I switch to another tab and reload them when I switch back. This interferes with my common use case of opening multiple pages in tabs and then reading them while offline and riding transit. Firefox for X11/Linux can keep pages open on a Dell Inspiron mini 1012 laptop with 1 GB of RAM, but Firefox for Android can't on a first-generation ASUS Nexus 7 tablet with the same amount of RAM. I guess the difference comes from two differences in the environment: swapping is more acceptable on X11/Linux than on Android, and desktop browsers are more likely to keep things in disk cache than mobile browsers.

Only some components of the notice of claimed infringement are under penalty of perjury. Others aren't. Please see parkinglot777's comment.

Sometimes the hard-to-understand part of the law is not the law itself as much as how it applies to the facts. One example is whether two works of authorship are "substantially similar" in areas beyond "idea, procedure, process," or other unprotectable elements. Another is whether factors in favor of fairness of a particular use of a work of authorship outweigh factors in favor of unfairness.

So how should somebody determine whether "something new [] has any likelihood of being illegal" without allowing the law to become a DoS on his sanity?

How about "The public can't reasonably be expected to obey laws that the median citizen doesn't understand"?

To me, readable means short enough that most people are capable of reading all laws that might affect them before leaving high school.