Blur elements on the page on click, add this script minified (https://javascript-minifier.com/) as a bookmark starting with `javascript:` string

blur.js

(function (document) {
  function _toggleBlur(event) {
    event.stopPropagation();

    if (window.blur_initiated) {
      event.target.classList.toggle('__blur')
    }
  }

  function addStyles() {
    if (!document.querySelector('#__blur')) {
      const $style = document.createElement('style');

      $style.innerHTML = `
        .__blur {
          filter: blur(7px);
        }
      `

      $style.id = '__blur'
      document.head.appendChild($style)
    }
  }

  function mount() {
    addStyles()

    const elements = document.querySelectorAll('body *')

    elements.forEach(element => {
      element.addEventListener('click', _toggleBlur)
    })
  }
  
  if (!window.blur_initiated) {
    mount();

    window.blur_initiated = true
  } else {
    window.blur_initiated = false
  }
})(document)