He saved lives during 23 years as Jersey City firefighter. Now he could use your help.

What dangerous multi-alarm fires could never do in two decades on the job, a set of a stairs did in a matter of seconds.

Bobby “Mac” MacArthur battled blazes in Jersey City for 23 years, retiring relatively unscathed in 2005. Now one of Jersey City’s Bravest could use a few heroes of his own after being severely injured in a fall at home.

MacArthur’s daughters, Lauren and Catherine, have created a GoFundMe campaign for pay for medical and travel expenses.

The former firefighter, who turns 65 this month, is in an induced coma and on a ventilator at a Morristown hospital after he was airlifted from his home in Sussex County, his family said.

Macarthur suffered a subdural hematoma, or brain bleed, as well as 10 broken ribs, a punctured and collapsed lung, internal bleeding, a broken collarbone and broken vertebrae in his neck and mid back when he fell down his basement stairs Jan. 21, Lauren said.

“He is equally as strong as he is crazy,” Lauren and Catherine said on their GoFundMe page. “We know he will recover from this. The doctors are telling us that road to recovery will be long and hard.”

On Jan. 27, MacArthur underwent thoracic surgery to clean up and remove the excess blood and fluid around his lungs and collarbone, the family said in the GoFundMe posting.

MacArthur’s wife of 37 years, Liz, “has been by his side every day even when his doctors and nurses tell her ‘He’s going to be like this for a while, you should go home and rest.’ ”

The donation drive raised $7,520 of a $10,000 goal as of Friday afternoon. By Sunday morning, more than $19,000 has been donated.

“My dad has always been a blue collar guy and would be the first person to give you the shirt off of his own back,” Lauren said. “My dad is equally as selfless as he is stubborn. If it isn’t his way, well, you’re doing it wrong. His stubbornness is coming in handy right now.

“He refuses to give up or give in. He has suffered a severe traumatic brain injury, but everyday he’s trying. Trying to wake up, trying to open his eyes, just trying ... in general.”