Safe.

OP here. It got cooked and eaten. No explosive diarrhea yet. Cross your fingers.

Yup should be totally fine!

-someone who left a pound of cooked chicken breast out overnight and ate it for lunch today

The fridge wouldn't get warm in less than 2 hours. Use your judgement and nose to decide.

Most likely. Of course if it smells off then probably not.

"Keep the refrigerator and freezer doors closed as much as possible to maintain the cold temperature. The refrigerator will keep food safely cold for about 4 hours if it is unopened. " http://www.fsis.usda.gov/wps/portal/fsis/topics/food-safety-education/get-answers/food-safety-fact-sheets/emergency-preparedness/keeping-food-safe-during-an-emergency/CT_Index

And Here is a list of how long food is safe to eat if it gets above 40 degrees: Refrigerated Food and Power Outages: When to Save and When to Throw Out
http://www.foodsafety.gov/keep/charts/refridg_food.html

Yes

Unless it is a really crappy fridge , yes.

Last night in Glover Park (my neighborhood), there was a power outage on several streets, including mine, from about 7:30 to 9:15. I have chicken in my fridge (skinless, boneless breasts). During the outage, the fridge was not opened. Can I use this chicken safely?

TIA