Reproduced the bug since 20181109101751. Steps to reproduce: if you have installed Nightly skip step 1 and step 2. 1. Download a Nightly build and extract it to folder A 2. Launch Nightly from folder A 3. Updete Nightly from Help menu, restart, then completely quit 4. Download an old Nightly same locale build[1] or later but not latest and extract it to folder B [1]http://archive.mozilla.org/pub/firefox/nightly/2018/11/2018-11-09-10-17-51-mozilla-central/firefox-65.0a1.en-US.win64.zip 5. Launch Nightly[1] with new profile 3. Help > About Nightly Actual Results: Nightly say "Nightly is unable to update" but build date is old. However after for about few minutes, the uptate process is automatically start Browser console shows the following error: TypeError: this.aus is undefined; can't access its "getAutoUpdateIsEnabled" property[Learn More] aboutDialog-appUpdater.js:260:9 onCheckComplete chrome://browser/content/aboutDialog-appUpdater.js:260:9 UC_onLoad jar:file:///L:/trunk/2018/11/firefox09-Nov-2018 101751 Nightly/omni.ja!/components/nsUpdateService.js:3398:7 UC_checkForUpdates/</< jar:file:///L:/trunk/2018/11/firefox09-Nov-2018 101751 Nightly/omni.ja!/components/nsUpdateService.js:3296:64 Expected Results: Nightly should start update process immediately Regression Window https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=12cc80a0e9968ade961879ee07effb815da691f0&tochange=5e7636ec12c5c4543b64428e15165031cff32dc4 Seems triggered by: Bug 1503362 @:bytesized, can you please look into this?

I'm actually leaning towards bug 1458308 in that bucket, which added that line. s/this.aus.getAutoUpdateIsEnabled/gAppUpdater.aus.getAutoUpdateIsEnabled/ ?

More data: The preference pane update check seems to use the same code, I get the same error. Unprompted software update just worked for me, I updated to https://hg.mozilla.org/mozilla-central/rev/39dba5141dd90c70a861299459d418d230148d9f.

Even if update prompt panel pops up, "About Nightly" say "Nightly is up to date"...

Just posting to confirm, as above, that a single install of Nightly behaves the same way as the original reporter describes -- wait for the next update to be available and Help->About continues to display "Nightly is up to date". This has been happening for at least three days, if that's any help.

Just talked to Robert on IRC and he says he has a fix for this.

Keeping this patch simple and will make the other changes in a new bug

Pushed to try https://treeherder.mozilla.org/#/jobs?repo=try&revision=6810459a9ddf7b3a023ee4380cd95f1cef9064c4

Comment on attachment 9024696 [details] [diff] [review] patch rev1 Please also note the change to using a strict equality check gAppUpdater.promiseAutoUpdateSetting === null

Discussed the strict equality check with bytesized and decided it isn't needed.

Pushed by rstrong@mozilla.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/0d856ddbfc64 Updating via Help > About broken on Nightly. r=bytesized

When I open the About Firefox dialog, I get: ReferenceError: reference to undefined property "promiseAutoUpdateSetting"[Learn More] aboutDialog-appUpdater.js:43:3

(In reply to Richard Marti (:Paenglab) from comment #14) > When I open the About Firefox dialog, I get: ReferenceError: reference to > undefined property "promiseAutoUpdateSetting"[Learn More] > aboutDialog-appUpdater.js:43:3 Thanks, I'll take care of that in bug 1506915 since I'll have to update the call sites.