If Content-Security-Policy does not allow eval then Firefox will block whole js script file from loading, means all of mdb.js is not loaded! Eval is a big security risk and should not be used. The try{}catch{} does not do anything when the js file is not loaded at all.

try {
// This works if eval is allowed (see CSP)
g = g || Function("return this")() || (1, eval)("this");
} catch (e) {
// This works if the window reference is available
if ((typeof window === "undefined" ? "undefined" : _typeof(window)) === "object") g = window;
}

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