Export-Import GitHub Labels

export.js

/**
 * Export Github Labels
 ****************************************************
 *
 * FIREFOX STEP BY STEP:
 * 1. Open the labels manage page e.g github.com/user/repo/lebels
 * 2. Open Scratch Pad (SHIFT + F4)
 * 3. Paste the code below and run
 * 4. Inspect Element > Console ( To read console log)
 * 5. Copy it the console.log results
 * 
 * @link https://gist.github.com/turtlepod/353ee764592d0dd357cb86f7830e8096/
 *
 * @link https://gist.github.com/MoOx/93c2853fee760f42d97f
 * @link https://gist.github.com/Isaddo/7efebcb673a0957b9c6f07cd14826ea4
**/

var labels = [];
[].slice.call(document.querySelectorAll(".label-link"))
.forEach(function(element) {
	labels.push({
		name: element.textContent.trim(),
		// using style.backgroundColor might returns "rgb(...)"
		color: element.getAttribute("style")
			.replace("background-color:", "")
			.replace(/color:.*/,"")
			.trim()
			// github wants hex code only without # or ;
			.replace(/^#/, "")
			.replace(/;$/, "")
			.trim(),
	})
})
console.log(JSON.stringify(labels, null, 2))

import.js

/**
 * Import Github Labels
 ****************************************************
 *
 * FIREFOX STEP BY STEP:
 * 1. Open the labels manage page e.g github.com/user/repo/lebels
 * 2. Open Scratch Pad (SHIFT + F4)
 * 3. Paste the code below
 * 4. Replace the labels array with your own labels data from export.js
 * 5. Run it, and see the new labels
 * 
 * @link https://gist.github.com/turtlepod/353ee764592d0dd357cb86f7830e8096/
 *
 * @link https://gist.github.com/MoOx/93c2853fee760f42d97f
 * @link https://gist.github.com/Isaddo/7efebcb673a0957b9c6f07cd14826ea4
**/
[
	{
		"name": "bugfix",
		"color": "eb6420"
	},
	{
		"name": "feature",
		"color": "0e8a16"
	},
	{
		"name": "hotfix",
		"color": "e11d21"
	}
]
.forEach(function(label) {
	addLabel(label)
})

function updateLabel (label) {
	var flag = false;
	[].slice.call(document.querySelectorAll(".labels-list-item"))
	.forEach(function(element) {
		if (element.querySelector('.label-link').textContent.trim() === label.name) {
			flag = true
			element.querySelector('.js-edit-label').click()
			element.querySelector('.label-edit-name').value = label.name
			element.querySelector('.color-editor-input').value = '#' + label.color
			element.querySelector('.new-label-actions .btn-primary').click()
		}
	})
  return flag
}

function addNewLabel (label) {
	document.querySelector('.new-label input#label-').value = label.name
	document.querySelector('.new-label input#edit-label-color-new').value = '#' + label.color
	document.querySelector('.new-label-actions .btn-primary').click()
}

function addLabel (label) {
	if (!updateLabel(label)) addNewLabel(label)
}

labels-example.js

[
  {
    "name": "bug",
    "color": "ee0701"
  },
  {
    "name": "duplicate",
    "color": "cccccc"
  },
  {
    "name": "enhancement",
    "color": "84b6eb"
  },
  {
    "name": "help wanted",
    "color": "128A0C"
  },
  {
    "name": "invalid",
    "color": "e6e6e6"
  },
  {
    "name": "question",
    "color": "cc317c"
  },
  {
    "name": "wontfix",
    "color": "ffffff"
  }
]

Thanks to @MoOx and @Isaddo for the code :)

You forgot the description : description: element.getAttribute("aria-label"), : https://gist.github.com/GuimDev/b29673641c85ed83526163f6aa290008