Crash signature - nsGlobalWindow cycleCollection UnmarkPurple nsISupports
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The template "crashsig" does not exist or has no approved revision. nsGlobalWindow::cycleCollection::UnmarkPurple(nsISupports*)
This type of crash is a bug that affects the current Firefox release. Mozilla is aware of this crash, and is trying to figure out what causes it.
For troubleshooting other types of Firefox crashes, see Firefox crashes - Troubleshoot, prevent and get help fixing crashes