How to fix 'Browser you're using doesn't support JavaScript or has JavaScript turned off' #Firefox

In this video I am going to show how to fix "Couldn't sign you in Google Account" and "The browser you're using doesn't support JavaScript, or has JavaScript turned off" in Firefox.

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[t.glenn.marshall]

I have javascript enabled and I still get the same anyone tell me how to fix this please

[nicolaspark]

My MacBook Air made it an accident the google account that the browser we’re using doesn’t support JavaScript.
What can I do it?

[lynchknot]

I have javascript enabled in FF and I still get that error message

[TinyBlueBerryGT]

I can't still open my GMAIL account in my macbook pro.Help 😩