Gigaset 504 AGU Instruction Manual page 73

Mozilla Firefox
Pop-ups are blocked by default. Carry out the following steps:
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Open Mozilla Firefox. Click Tools and then Settings.
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Click on the Content icon.
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Deactivate the Block Popup window option.
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Click OK to finish.
Please note:
Should you use a different pop-up blocker, you must configure this accordingly.
Appendix
73