unMask.js

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 - unMask.js -- Display All elements / objects with flag invisible or hidden will be shown

Paste into console (on a page with a decent amount happening - you will be suprised): (just this one line)
  
document.querySelectorAll('*').forEach(el => { if (getComputedStyle(el).display === 'none') el.style.display = 'block'; });

Pro tip - set break points with XHR Watch/Breakpoint - at various points in the execution/runtime and try this . 
  you may be suprised