FF133 Document.caretPositionFromPoint shadow root behaviour - nightly #25177
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FF133 rolls back the shadow mode behaviour on Document.caretPositionFromPoint that was added as a parameter option in FF133 in #24405 (and originally documented in mdn/content#35702).
The option is now behind a pref that is set to be enabled in nightly/preview, as per https://bugzilla.mozilla.org/show_bug.cgi?id=1914596#c8