The event is used in 3 places: [BrowserReloadWithFlags()](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/base/content/browser.js#3498,3532), [tabs.duplicate()](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/components/extensions/parent/ext-tabs.js#1126), and [BrowserUsageTelemetry](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/modules/BrowserUsageTelemetry.jsm#45,539). The latter two appear to rely on the event solely for the fact that at this point the browser has the updated URI. Will look into an alternate solution for these (maybe they can use the load event instead?), but this is probably a WONTFIX.
Bug 1709132 Comment 3 Edit History
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The event is used in 3 places: [BrowserReloadWithFlags()](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/base/content/browser.js#3498,3532), [tabs.duplicate()](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/components/extensions/parent/ext-tabs.js#1126), and [BrowserUsageTelemetry](https://searchfox.org/mozilla-central/rev/1df3b4b4d27d413675fb66f375230cb25d636450/browser/modules/BrowserUsageTelemetry.jsm#45,539). The latter two appear to rely on the event solely for the fact that at this point the browser's `currentURI` is updated. Will look into an alternate solution for these (maybe they can use the load event instead?), but this is probably a WONTFIX.