The firefox icon disappears from my computer and I can't reinstall it.

When i shut down my computer, often the firefox icon will be gone when I restart. I was just reinstalling it, but now I no longer can. Please help in terms I can understand as I am very inexperienced in computers. I got a new Macintosh in January and found it difficult to buy on ebay with Explorer. Firefox solved this problem and I want it back.

If you mean the Messages app and you're running OS X 10.7, then you had installed the now-expired beta. To get it back, you would have to upgrade to 10.8.

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