The error description.
0 indicates the navigation happens in the tab content window; a positive value indicates navigation in a subframe.
0 indicates the navigation happens in the tab content window; a positive value indicates navigation in a subframe. Frame IDs are unique within a tab.
The ID of the process that runs the renderer for this frame.
The ID of the process that runs the renderer for this frame.
Missing in firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1248426
The ID of the tab in which the navigation occurs.
The time when the error occurred, in milliseconds since the epoch.