I was diagnosed with genital warts a couple of years, i slept over at a friends house and used one of their blankets, i had on long pyjamas, is this safe?

Yes: There is no risk for transmission in above mentioned scenario. Skin to skin contact is to be avoided in order to prevent transmission.

Agree with Dr. P: Get HPV vaccine to prevent infection with other strains of HPV that can cause cervical cancer. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/. Wish you good health!