They're just removing an antiquated file type that you should have moved on from anyway. All my books are in epub format and even if they weren't calibre converts them so I don't think this is a significant change at all.
I've tried firefox in the past. Back and forth I go when google does something dumb but I always go back. This time I think I'll deal with the stuff I don't like for now, or maybe make extensions to fill the voids that I miss desperately.
As long as you set it up correctly ( unlike myself) and go through your media to make sure you don't accidentally have duplicates (like I do) it shouldn't take up much space. The actual -arrs themselves don't use hardly any space.
How does that make his contributions wrong?