Firefox won't install after uninstall

Hey all,
I just bought a new 2012 rMBP and a local authorized computer repair shop transfered over my data from my old laptop, which was a macbook as well. The only reason i had them do it is because my old laptop was subject to severe water damage, and I had no way to access the HDD
Anyway, he transfered over my apps, files, and everything. Firefox was transfered over as well. I uninstalled firefox by dragging it from the applications menu to the trash, and then downloaded the current copy (the one that was installed on my old laptop was 6 releases behind). I go to install the newly downloaded copy and it tells me there is already a firefox installed, and i can replace, leave it alone, or stop. If I pick "replace" it gives me a message of:
"The operation can’t be completed because some items had to be skipped. For each item, choose File > Get Info, make sure “Locked” is deselected, and then check the Sharing & Permissions section. When you are sure the items are unlocked and not designated as Read Only or No Access, try again."
I've searched for firefox files and there are none.
Where do I go from here?

Back up all data if you haven’t already done so. Before proceeding, you must be sure you can restore your system to the state it’s in now.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
sudo chflags -R 0 /Applications/Firefox.app
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command.
Try the installation again. If it works, you can quit Terminal.

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Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
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You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command.
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Firefox won't install after uninstall

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