With bug 1692468 the cache of nodes is moved from the parent to the content process, but not all the aspects of [the change in the WebDriver spec] have been taken care of yet.
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With bug 1692468 the cache of nodes is moved from the parent to the content process, but not all the aspects of [the change in the WebDriver spec](https://github.com/w3c/webdriver/pull/1705) have been taken care of yet.