How to Hack Firefox as iPhone mobile viewer, Watch Playboy and Penthouse for free in Zinio

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iSmashPhone has this post that teaches us how to hack Firefox as iPhone mobile viewer. Then you can watch Playboy and Penthouse from Zinio for free!

Zinio let iPhone user watch Playboy and Penthouse for free is one thing. What amazes me more is how easy it is to hack Firefox to have an iPhone mobile viewer, which is a great news for people without iPhone, like me.
The following part seems to be important, but so far, pages from other servers look alright without doing it.

To reverse this process and return to regular Firefox mode, you must go back into "about: config".
Then scroll down to the "general.useragent.override" and right click it. Select Reset.

Actually it is indeed important. I later found out that the first impact came when I download softwares. All the servers will give me Mac version, instead of Windows', although I am using Vista or XP. So better switch it back to Firefox before getting into more troubles