A little helper userscript to make downloading NSPs from Switch Pirates a bit more tolerable

DiscordSwitchPiratesHelper.user.js

// ==UserScript==
// @name         Discord Switch Pirates Helper
// @namespace    http://tampermonkey.net/
// @version      2.1.1
// @description  Arr!!
// @author       AltiCodes
// @match        *://discordapp.com/channels/*
// @grant        GM_setClipboard
// @inject-into  auto
// @downloadURL  https://gist.github.com/AltiCodes/3b94a627f797baf03f0e25e6b2d221d3/raw/DiscordSwitchPiratesHelper.user.js
// ==/UserScript==

(function() {
    'use strict';
  
    const is_switch_pirates_embed = (message) => {
        const embedAuthor = message.getElementsByClassName('embedAuthor-3l5luH')[0]
        if (!embedAuthor)
          return false
        return embedAuthor.textContent == 'Switch Pirates'
    }
    
    const magic_atob = (content) => {
        try {
            return window.atob(content)
        } catch(e) {
            return content
        }
    }

    const update_messages = () => {
        Array.from(document.querySelectorAll('.containerCozyBounded-1rKFAn .markup-2BOw-j')).forEach(message => {
            if (!is_switch_pirates_embed(message))
                return
            if (message.querySelector(".copyAllTheLinks") != null)
                return
         
            const p = message.getElementsByClassName('embedDescription-1Cuq9a')[0]
            let allLinks = []
            const nodes = [...p.childNodes.entries()]
            nodes.slice(Math.max(nodes.length - 3, 1)).map(a => a[1].remove())
            nodes.map(node => node[1]).filter(node => node.nodeName === "#text").map(text => {
              const links = text.textContent.trim().split("\n").map(magic_atob).filter(a => a.startsWith("http"))
              if (links.length == 0)
                return
              if (!text.parentNode) 
                return
              const awoo = document.createElement("div")
              awoo.style.cssText = "color:cyan;margin-bottom:1em;"
              links.map((link, index) => {
                let awau = document.createElement("a")
                awau.href = link
                awau.appendChild(document.createTextNode(`[Link #${index+1}] `))
                awoo.appendChild(awau)
              })
              allLinks.push(...links)
              text.parentNode.replaceChild(awoo, text)
            })

            const saveall = document.createElement("button")
            saveall.classList.add(..."button-38aScr lookFilled-1Gx00P colorBrand-3pXr91 sizeSmall-2cSMqn grow-q77ONN copyAllTheLinks".split(' '))
            saveall.style.marginTop = "10px"
            const saveallText = document.createElement("div")
            saveallText.classList.add("contents-18-Yxp")
            saveallText.appendChild(document.createTextNode("Copy all"))
            saveall.appendChild(saveallText)
            saveall.onclick = (e) => {
              GM_setClipboard(allLinks.join(' '))
              const copied = document.createElement("div")
              copied.style.cssText = 'color:cyan'
              copied.appendChild(document.createTextNode(`Arr! ${allLinks.length} link${allLinks.length != 1 ? 's' : ''} copied.`))
              p.parentNode.insertBefore(copied, p.nextSibling)
            }
            message.appendChild(saveall)
        })
    }

    const checkChannel = (changes) => {
        for(let change of changes){
            if(change.addedNodes.length){
                setTimeout(update_messages, 1000)
            }
        }
    }

    const channel = new MutationObserver(checkChannel)

    window.onload = () => {
        setTimeout(function(){
            let elem = document.getElementsByClassName('content-yTz4x3')[0].firstChild
            channel.observe(elem, {childList: true})
            update_messages()
            console.log('%c[Discord Switch Pirates Helper]'+'%c has loaded', 'background:black; color:cyan', 'color:black')
        }, 2000)
    }
})()

Works great! Personally I'd change line 53 to awau.appendChild(document.createTextNode(`${link}\n`)) so the links are easier to copy & paste as plain text.

For some reason Tampermonkey in Chrome wouldn't run this for me until I enclosed the if blocks in { brackets }. After that, it works great. @Raicuparta 's edit works great too!

On Firefox I also needed to add brackets for every if statement.
It also does not work on new messages, until I refresh the page manually.