Catch Misspelled Variable and Function Names (firefox not showing undefined variables)

Tell us what’s happening:
my undefined variables show the errors in FCC but not in the browser(firefox) console they were showing logs and typeofs and when i change the spelling errors the consolelog does show but before that my browsers console is just empty no defining error message

EDIT moved onto the next challenge and same behavour with missing brackets on the next challenge

Your code so far

let receivables = 10;
let payables = 8;
let netWorkingCapital = receivables - payables;
console.log(`Net working capital is: ${netWorkingCapital}`);

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0.

Link to the challenge:

If you run the tests without making any changes (in Firefox or any other browser), you should see this: