Diễn đàn hỗ trợ Firefox

Today I used firefox on my PC, using duckduckgo. I searched "iKnee" which is a brand of knee massager. I found that site but also in the search results there were several offensive porn sites listed. The first time that's ever happened. Why has it happened this time? Can I prevent it happening again?

Windows 10 pc can not start,I have gone through automatic repair and diagnostics steps,but am now on advamced options and think I need to Reset it.This will lose Firefox.When I install it again will I be able to sign into my Firefox account to retrieve bookmarks and passwords?I am very nervous about this,don't even know how to install Firefox,as someone gave me the computer and it was already in there. I am a tech dinosaur!Thank you in advance for any help.Lesley

Once I pull up firefox, I NEVER get a search window to start my search. The only 1 that shows at the bottom is chrome? I do get the jump back in, but nothing to start a new one.