ReadableStream halts halfway while downloading a large file on Firefox 78.2

Question

I am using the ReadableStream API to stream blocks of a large CSV file of 128 MB with more than 300,000 rows of data. I have followed the MDN ReadableStream documentation to create a ReadableStream and enqueue chunks, but somehow the ReadableStream stops reading halfway. It ends up reading only 40,000 rows. My code:

  const reader = file.stream().getReader();

  reader.read().then(function processText({ done, value}) {
    if (done) {
      console.log('done');
      return;
    }

    // console.log('streaming');
    console.log(value);

    return reader.read().then(processText);
  });

• On Chrome and Edge, the file loads correctly:
• On Firefox, it just hangs halfway: