message: docs: remove information about which version of Firefox started supporting custom elements
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diff: @@ -103,7 +103,7 @@ The recently-developed [custom elements](https://developer.mozilla.org/en-US/doc
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  <td>Firefox</td>
  - <td>Supported natively as of version 63. In older versions: Set the <code>dom.webcomponents.enabled</code> and <code>dom.webcomponents.customelements.enabled</code> preferences to true.</td>
  + <td>Supported natively.</td>
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  <td>Edge</td>
  