Firefox console does not warn about undefined variables

Add-ons Development
#1

I’m using 50.0a2 Developer Edition( also used Nightly 51…)

The browser console does not give any indication about undefined variables.

I’d need to wrap using:

try{
fun();
}catch(e){
console.log(e);
}

To get to know about undefined variables.

Though I could see a related warning in the Background page console for the reason of why a variable defined in the file could not be loaded( please see the photo)

0112.jpg873×26 3.76 KB

Can someone tell me the reason?

#2

Undefined variables are not wrong. The only thing that you can not do is use variables declared as let and const before they are declared.

#3

Sorry it is actually an undefined function. There is syntax error in a file so the a function in it will get undefined in another extension file.

I hope to get a warning about undefined function though.