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Editorial Team
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Asked: 2026-05-13T16:04:33+00:00

I’m getting this message in error console: Error: uncaught exception: [Exception… Cannot modify properties

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I’m getting this message in error console:

Error: uncaught exception: [Exception... "Cannot modify properties of a WrappedNative"  
nsresult: "0x80570034 (NS_ERROR_XPC_CANT_MODIFY_PROP_ON_WN)"  location: "JS frame :: 
chrome://global/content/bindings/autocomplete.xml :: onxblpopuphiding :: line 834"  data: no]

I checked everything I’ve possibly can, but I don’t see what’s wrong! I tried clearing cache, 3 times. I tested on a second computer, and it still doesn’t work. Edit: It shows the data for one second or so and then disappears.

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1 Answer

  1. Editorial Team

    The values were disappearing because the submit button is posting the form and therefore refreshing the page. Simply change:

    <input type='submit' value='Submit' onclick='process()'>

    to:

    <input type='button' value='Submit' onclick='process()'>

    … and the data will not disappear when you click the button.

    An <input type="button"> defines a clickable button, that does not automatically submit the form when clicked. In fact this button type is often used to call a JavaScript function through the onClick event, as you were doing in your web page.

    As for the uncaught exception, this is probably related to a browser plugin, as Sarfraz Ahmed suggested.

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