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It's a bit... hard.

Well, on Mozilla Firefox, you need XPInstall

Answer:

It's simply a Zip file with a different extension. Just rename it.

Answer: Open the window that holds the .xpi file in it. Size it so that it covers half your screen. Then open Firefox and size it to the other half of your screen. Drag the file from the 1st window to the second window and Firefox will take over. Good luck!

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Wiki User

16y ago

What else can I help you with?