Now I'm in the school in usa. There's no firefox in this computer, and I can't use a flash drive here, which means no portable firefox.

What do you think if there is a firefox embedded in ie? Maybe it's like a plug-in, just like the ietab in ff, or a website you can login to get some special online supporting, like some newer online service. One example is a site giving you ability to add notes to any webpage you want. Once you login, those notes appear in the right page no matter where you are. When you can't download or install firefox, It's a way.

Just a sudden idea.