OnBeforeNavigateDetails

0 indicates the navigation happens in the tab content window; a positive value indicates navigation in a subframe. Frame IDs are unique for a given tab and process.

Since Chrome 24. ID of frame that wraps the frame. Set to -1 of no parent frame exists.

Deprecated since Chrome 50. The processId is no longer set for this event, since the process which will render the resulting document is not known until onCommit. Always returns the value of -1.

Missing in firefox https://bugzilla.mozilla.org/show_bug.cgi?id=1248426

The ID of the tab in which the navigation is about to occur.

The time when the browser was about to start the navigation, in milliseconds since the epoch.