browser.printing

{
  "name": "My extension",
  ...
  "permissions": [
    "printing"
  ],
  ...
}

browser.printing.onJobStatusChanged.addListener((jobId, status) => {
  const cancelButton = document.getElementById("cancelButton");
  cancelButton.addEventListener('click', () => {
    browser.printing.cancelJob(jobId).then((response) => {
      if (response !== undefined) {
        console.log(response.status);
      }
      if (browser.runtime.lastError !== undefined) {
        console.log(browser.runtime.lastError.message);
      }
    });
  });
  if (status !== "PENDING" && status !== "IN_PROGRESS") {
    cancelButton.style.visibility = 'hidden';
  } else {
    cancelButton.style.visibility = 'visible';
  }
}

​​const printers = await browser.printing.getPrinters();
const defaultPrinter = printers.find((printer) => {
  const printerInfo = await browser.printing.getPrinterInfo(printer.id);
  return printerInfo.isDefault;
}
console.log(`Default printer: ${defaultPrinter.name}.\n\t${defaultPrinter.description}`);

const defaultPrinter = getDefaultPrinter();
const ticket = getPrinterTicket(defaultPrinter);
const arrayBuffer = getPrintData();
const submitJobRequest = {
  job: {
    printerId: defaultPrinter,
    title: 'test job',
    ticket: ticket,
    contentType: 'application/pdf',
    document: new Blob([new Uint8Array(arrayBuffer)], {
      type: 'application/pdf'
    });
  }
};

browser.printing.submitJob(submitJobRequest, (response) => {
  if (response !== undefined) {
    console.log(response.status);
  }
  if (browser.runtime.lastError !== undefined) {
    console.log(browser.runtime.lastError.message);
  }
});

const ticket = {
  version: '1.0',
  print: {
    vendor_ticket_item: [{id: 'finishings', value: 'trim'}],
    color: {type: 'STANDARD_MONOCHROME'},
    duplex: {type: 'NO_DUPLEX'},
    page_orientation: {type: 'PORTRAIT'},
    copies: {copies: 1},
    dpi: {horizontal_dpi: 300, vertical_dpi: 300},
    media_size: {
      width_microns: 72320,
      height_microns: 100000
    },
    collate: {collate: false}
  }
};

"vendor_capability": [
  {
    "display_name": "finishings/11",
    "id": "finishings/11",
    "type": "TYPED_VALUE",
    "typed_value_cap": {
      "value_type": "BOOLEAN"
    }
  },
  ...
]

"media_size": {
  "option": [
  {
    "custom_display_name": "",
    "is_continuous_feed": true,
    "max_height_microns": 2000000,
    "min_height_microns": 25400,
    "width_microns": 50800
  },
  ...
  ]
}