Why do the Spoilers not work when I use Chrome/Safari?

I'm currently running this thread but I'm getting some wierd problems.
 
I always have used Firefox but everytime I add a name or spoiler to the table firefox crashes for 5 seconds before finally implementing my changes.
 
I thought I would try another browser but for some reason both Chrome and Safari won't make a spoiler. Is there a setting I can change somewhere to fix this problem? 
 
Thanks in Advance

Spoilers have always been mad jank, I have had very limited success with using them on firefox. Usually they can't be clicked on to open or start open and won't close. They just suck.