My Javascript gives syntax error in Chrome and Safari but doesn't give error in Firefox?

Question:

These are my files:

    <script type="text/javascript" src="js/jquery-1.9.1.js"></script>
    <script type="text/javascript" src="js/jquery-ui.js"></script>
    <script type="text/javascript" src="js/bootstrap.min.js"></script>
    <script type="text/javascript" src="js/bootstrap-collapse.js"></script>
    <script type="text/javascript" src="js/bootstrap-tab.js"></script>
    <script type="text/javascript" src="js/jquery.mCustomScrollbar.concat.min.js"></script>
    <script type="text/javascript" src="js/custom.js"></script>

I have the following problem:

On Mozilla Firefox it works perfectly. In Chrome and Safari they don't run at all. Mistake:

Uncaught SyntaxError: Unexpected token > custom.js:401

Has this problem ever occurred to anyone?

Answer:

I found the error.

On line 401 of my custom.js file I made a condition with the logical operator "Greater or Equal" like this:

=>

the correct one is like this:

>=

But I found it strange that in Firefox it ran normally.

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