Miscellaneous

Will the following be considered as aiding in sin?

Q: Is it haraam for me to make and sell furniture to people if I know it is more than likely that they will (at some point) be more than likely to use the furniture when doing haram things i.e. they would be more than likely to at some point store haram cloths in a closet or have unmarried adult relations on a bed I made, or use a table I made to eat pork or put alcoholic drinks on, or watch haram TV programs on the sofa I made and sold to them? Is making and selling these things cooperating in sin and transgression?

Is wasting time a sin and if so, is selling footballs or remote control cars to people cooperating, influencing sin, if I know they (adults) are going to
excessively waste time playing with them?

Slavery

Q: I want to know the concept of kaneez/loundi in Islam. Is this rule still applicable like the previous age? Or that was for the present time? If this practice has been stopped then how? What does the Qur'an say about it?

Chipping a car

Q: Is "chipping" a car (i.e paying a company to change the software on a car, to make the car faster) permissible? Or would this fall under wastage of money?