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Why is FileReader.onerror not called in readAsArrayBuffer on NS_ERROR_FILE_ACCESS_DENIED? (Chrome does)

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When reading a file via javascript readAsArrayBuffer and file is not readable, Firefox does not call "onerror" handler and instead stops the javascript with error: NS_ERROR_FILE_ACCESS_DENIED

blob = file.slice(0,1); var reader = new FileReader; reader.onerror = function(e) {

  // this is called under Chrome, but not under Firefox
  console.log('reader.onerror'); 

} reader.readAsArrayBuffer(blob); // this stops with NS_ERROR_FILE_ACCESS_DENIED

According to FileAPI it should: https://developer.mozilla.org/en-US/docs/Web/API/FileReader

When reading a file via javascript readAsArrayBuffer and file is not readable, Firefox does not call "onerror" handler and instead stops the javascript with error: NS_ERROR_FILE_ACCESS_DENIED blob = file.slice(0,1); var reader = new FileReader; reader.onerror = function(e) { // this is called under Chrome, but not under Firefox console.log('reader.onerror'); } reader.readAsArrayBuffer(blob); // this stops with NS_ERROR_FILE_ACCESS_DENIED According to FileAPI it should: https://developer.mozilla.org/en-US/docs/Web/API/FileReader

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