2069403 - `urlbar.bounce` follows the tab the search was made in, not the one the result opened in

Status: NEW

(Firefox :: Address Bar, defect, P2)

Description

[Dão Gottwald [:dao]]

Picking a result with Alt+Enter, or any modifier that opens a new tab, tracks the bounce against the browser of the tab the engagement happened in. The results page loads in a different tab, so leaving or closing the tab carrying the results records nothing, and closing the tab the search was made in -- which never showed the results -- records a bounce instead, taking its view time from that tab's Interactions.

Measured with a scratch task in browser/components/urlbar/tests/browser-engagementTelemetry/browser_glean_telemetry_bounce.js: an Alt+Enter engagement followed by closing the result tab records no urlbar.bounce; closing the source tab afterwards records one, with view_time from that tab's stubbed interactions. Identical at the parent of bug 2068488, so it predates the parent-side bounce store.