Linux Mint implicates Pale Moon (i.e., "Buggy client").
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(metacity:1683): metacity-WARNING **: 04:18:20.260: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x5000178 (Pale Moon)
(metacity:1683): metacity-WARNING **: 04:18:20.260: meta_window_activate called by a pager with a 0 timestamp; the pager needs to be fixed.
Possibly related: With that combination, I've also experienced occasional network disconnects that seem to be correlated with Pale Moon sessions. Reconnections are immediate, but any situation that disturbs the network connection is bad.
The Linux Mint Forum posting (link, above) includes links to crash dumps.
Kindly let me know of any mitigation, or if you require any further information.
Regards,
Mark Filipak.
PS: If Linux Mint is running with display software emulation (i.e., without VBox's VMSVGA driver), there are no crashes.