v0.5.2

The pin moves to invisible-core 47.39.0, which seals the firefox-47 engine.

Fixed

• A page can no longer tell that the engine carries the automation protocol.
  Every engine until firefox-47 registered the protocol as a chrome package named
  juggler, and a page tells a registered package from an absent one with one
  line, new Worker("chrome://juggler/..."): it returns on our engine and throws
  SecurityError on Firefox. Captcha vendors started probing it in October 2026,
  which is why a challenge solved by hand was still refused. firefox-47 loads the
  protocol from resource://gre/modules/juggler/, a namespace every Firefox has
  and inside which a page cannot tell which files exist; the engine now registers
  exactly the chrome packages and resource substitutions Firefox 151 does.
• A get() that the page stops or replaces on its way answers as
  geckodriver's does, measured for every way a page can: stopped with
  nothing in its place (document.open(), window.stop()), it waits out the
  page load timeout and raises "Navigation timed out after N ms"; replaced by
  another document (a location.replace, a form submit, an iframe navigating
  the top, going back), it returns once that document loads. Until 0.5.1 the
  engine dropped the stop and get() ended by accident, and a replacement
  raised WebDriverException in the words of WebDriver BiDi ("A new navigation
  interrupted an unfinished navigation"), which the classic get never says.
• The wheel is born before the page sees it, as keys and mouse moves are
  since 0.35.7: event.timeStamp was the instant the wheel reached the page,
  0 to 2 ms below performance.now() in the handler where a real wheel is 6
  to 14, and half of the wheel events failed the filter a tracker applies.