And this is why Reddit is much more interesting than Slashdot nowadays. There's so much more and all the interesting people are there too. Slashdot only has extreme pro-piracy and extreme pro-FOSS people who call shill on anyone that dares to have different opinions on those things.
Apple's stance is the same reason we don't want non-Microsoft browsers ruining the security of our Windows RT tablets and draining battery. IE9 (and IE10 more so) are currently the most secure browsers on the market.
Firefox lacks completely security features like sandboxing, just-in-time (JIT) hardening and plug-in security. Internet Explorer can withstand against attacks to Flash and PDF Reader (most attacks now are against third party software), while Firefox just lets them infect the system. On top of that Firefox is extremely resource needing which would just drain the battery on tablets. No thanks, give me IE any day over that. (Yes, I know old IE's suck.. but try the new ones, they're actually good. Much like Chrome)