main.js

/** 
 * Youtube bulk unsubsribe fn.
 * Wrapping this in an IIFE for browser compatibility.
 */
 (async function iife() {
    // This is the time delay after which the "unsubscribe" button is "clicked"; Tweak to your liking!
    var UNSUBSCRIBE_DELAY_TIME = 2000
  
  /**
   * Delay runner. Wraps `setTimeout` so it can be `await`ed on. 
   * @param {Function} fn 
   * @param {number} delay 
   */
    var runAfterDelay = (fn, delay) => new Promise((resolve, reject) => {
      setTimeout(() => {
        fn()
        resolve()
      }, delay)
    })
  
  
  
    // Get the channel list; this can be considered a row in the page.
    var channels = Array.from(document.getElementsByTagName(`ytd-channel-renderer`))
    console.log(`${channels.length} channels found.`)
  
    var ctr = 0
    for (const channel of channels) {
      // Get the subsribe button and trigger a "click"
      channel.querySelector(`[aria-label^='Unsubscribe from']`).click()
      await runAfterDelay(() => {
        // Get the dialog container...
        document.getElementsByTagName(`yt-confirm-dialog-renderer`)[0]
          // and find the confirm button...
          .querySelector(`#confirm-button`)
          // and "trigger" the click!
          .click()
        console.log(`Unsubsribed ${ctr + 1}/${channels.length}`)
        ctr++
      }, UNSUBSCRIBE_DELAY_TIME)
    }
  })()