ஆண்ட்ராய்டிற்கான பயர்பாக்ஸ் ஆதரவு மன்றம்

When using Paypal I keep getting warnings from Firefox that it is an unsafe site. What steps can I take to make Paypal safe and stop getting the warnings? I've looked in the settings area but can't find what might relate to making a site safe.