Problem!

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I have an Asus Linux netbook.  I am having problem with getting e-mails through Yahoo.  My daughter is also not able to play on the Club Penguin website.  She was  able until a few days ago.  Now the screen/graphics won’t come up.  Things we have done and are still not able to get to these sites:
1.  Updated Firefox
2.  Updated Adobe Flash Player
3.  Updated Java
4.  Downloaded SeaMonkey web browser, but can’t find it.

We are very frustrated!  If someone could please help us, it would be greatly appreciated!