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I'm currently receiving a weird JavaScript error on my error monitoring tool Sentry that says can't redefine non-configurable property "userAgent".
It seems like the error is happening on multiple pages but only on Firefox. Additionally, on all errors the referrer page seems to be "https://www.startpage.com/".
However, I'm not able to reproduce the error and have no clue whats causing the error as I do not have any assignments to the navigator.userAgent var.
Does anyone else have this issue, too, or has any clue what could cause this error?
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The Navigator userAgent property is used for returning the user-agent header's value sent to the server by the browser. It returns a string representing values such as the name, version, and platform of the browser.
The user-agent string of the browser is accessed using the navigator. userAgent property and then stored in a variable. The presence of the strings of a browser in this user-agent string is detected one by one. Detecting the Chrome browser: The user-agent of the Chrome browser is “Chrome”.
I have seen this exact message before when trying to call Object.defineProperty on a property that is 'non-configureable' in strict mode. You have something in your code or in one of your deps that is trying to redefine a property using this method.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Cant_delete
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