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awk -F'\t' 'p1!=$1{c=1;n=1}
{$(NF+1)= "Fr" $1 "." n}
!(c%5){n++}
{c++;p1=$1}1' OFS='\t' file

Try


awk '{a++;if(!(a%5) || NR==1){s++}
{if(P != $1){s=1;a=0}}
{P=$1;$(NF+1)="Fr"$1"."s}}1' file

Gnu grep has -C option

try this

grep -C 2 "abc1.1" input.txt