Tomatoes
When you put tomatoes in the refrigerator, you are only helping them lose flavor quicker, sour the texture, and slow down the ripening process. Therefore, keep the tomatoes on the counter, in a bowl!
Tuna
As long as canned tuna is sealed, there is no need to put it inside of the refrigerator! It can stay at room temperature without going bad, this is 99% due to the fact that canned tuna has tons of preservatives inside of it.