Here's my app.update.log:
AUS:SVC Checker: checkForUpdates, force: true
AUS:SVC Checker:getUpdateURL - update URL: https://www.waterfoxproject.org/update/win64/34.0.1/en-US/release/update.xml?force=1
AUS:SVC recordInHealthReport - updateCheckStart - 0
AUS:SVC Checker:checkForUpdates - sending request to: https://www.waterfoxproject.org/update/win64/34.0.1/en-US/release/update.xml?force=1
syntax error update.xml:1
AUS:SVC Checker:onLoad - request completed downloading document
AUS:SVC Checker:_updates get - unexpected node name!
AUS:SVC Checker:onLoad - there was a problem checking for updates. Exception: Error: Unexpected node name, expected: updates, got: parsererror
AUS:SVC Checker:onLoad - request.status: 404
AUS:SVC getStatusTextFromCode - transfer error: Update XML file not found (404), code: 404
AUS:SVC recordInHealthReport - updateCheckFailed - 1404
Thanks. Yes, I hope you really can fix this as this is the single problem I have with FF/WF. It's really a major one though.
Ahhh there's the error! Looks like there's been a change from en-us to en-US (note the capitals) in the request and so it's returning a 404 error. Just need to copy the directory and it'll start auto updating again :)