Check this link; https://www.bing.com/search?q=Zynga+virus&qs=n&form=QBRE&pq=zynga+virus&sc=8-6&sp=-1&sk=&cvid=6F90F2C7BF5744649E01DB66F364A165 ----------------------- You may have ad / mal-ware. Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article. Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.