In Firefox it is returning this

{ "success": false, "error-codes": [ "browser-error" ] }stdClass Object ( [success] => [error-codes] => Array ( [0] => browser-error ) )

In Chrome it works

What does browser-error mean and how do I sort it out please. Thanks

I originally tried Firefox and that is what I got so I then tried it in Chrome and it worked. I have also tried googling for an answer. I am using PHP