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Wikipedia: toggle infobox visibility

Hides or restores the side infobox with a single click whenever you want a quick look at it.

Code to copy

// Toggle the infobox visibility on and off
const ID = 'jz-wik-hide-infobox';
const old = document.getElementById(ID);
if (old) { old.remove(); }
else {
  const s = document.createElement('style');
  s.id = ID;
  s.textContent = '.mw-parser-output .infobox,.mw-parser-output .sidebar' +
    '{display:none!important}';
  document.head.appendChild(s);
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Enable the action panel, add a button in the Actions tab and paste the code into it — run it with one click.