Checkboxes that kill your product
> Shouldn’t you be able to restrict how much disk space is being used? It turns out, we know that you are low on disk space, and will reduce our usage accordingly. It’s pretty likely that Firefox keeps better track of this than humans do.No.  Here's a case where Firefox will definitely not do a better job: an NFS-based computer lab environment where users have individual quotas - the statfs() syscall (i.e. what the `df` command uses) returns you the amount of disk space available to everyone, which is enormous.  Firefox then attempts to use that space, and quickly exhausts the user's quota.  This is a real-life scenario and the current solution among users is to set the cache size to 0 - the Internet connection is damn fast anyways and they'd rather use their space to store actual files.For the love of god, what is wrong with having an Advanced options panel?  The author's stated goal is "to design software that can be used by everyone " but when you remove options like this, you make your product not usable by some people unless they do additional research to find the hidden about:config option or install some add-on.The bug for this is https://bugzilla.mozilla.org/show_bug.cgi?id=851698 - if you think this is a bad idea I encourage you to leave a comment there (but be nice).  Mozilla may otherwise not realize that this is such a bad, unpopular idea.