1. Run the setup wizard by double-clicking the setup icon on your desktop. Follow the instructions in the setup wizard to install the program. A Firefox icon will appear on your desktop when the installation is complete.
2. Open the program by double-clicking the Firefox icon.
3. Verify the pop-up blocker option has been enabled by clicking "Tools" and selecting "Options."
4. Click the "Content" icon and check "Block pop-up windows"."
5. Click "OK" to close the Options window
Hopefully it may help to remove popup