Traceback (most recent call last): File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\marionette\marionette_test.py", line 296, in run testMethod() File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\firefox_ui_harness\decorators.py", line 15, in wrapper return target(self, *args, **kwargs) File "c:\jenkins\workspace\release-mozilla-release_functional\venv\Lib\site-packages\firefox_ui_tests\functional\private_browsing\test_about_private_browsing.py", line 52, in testCheckAboutPrivateBrowsing tab = pb_window.tabbar.open_tab(trigger=tab_opener) File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\firefox_puppeteer\ui\tabbar.py", line 130, in open_tab trigger(self.selected_tab) File "c:\jenkins\workspace\release-mozilla-release_functional\venv\Lib\site-packages\firefox_ui_tests\functional\private_browsing\test_about_private_browsing.py", line 49, in tab_opener link = tab.marionette.find_element(By.ID, 'learnMore') File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\marionette_driver\marionette.py", line 1713, in find_element return self._send_message("findElement", body, key="value") File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\marionette_driver\decorators.py", line 36, in _ return func(*args, **kwargs) File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\marionette_driver\marionette.py", line 716, in _send_message self._handle_error(resp) File "c:\jenkins\workspace\release-mozilla-release_functional\venv\lib\site-packages\marionette_driver\marionette.py", line 770, in _handle_error raise errors.lookup(error)(message, stacktrace=stacktrace) NoSuchElementException: NoSuchElementException: Unable to locate element: learnMore

Also encountered while running the ESR 38.4.0 tests: http://mm-ci-production.qa.scl3.mozilla.com:8080/job/release-mozilla-esr38_functional/lastSuccessfulBuild/artifact/report.html.

That's the screenshot of a ru build when this failure happens. I would have to compare it with an en-US build to see what's the difference is.

The screenshot does not make any sense. It's for the about:privatebrowsing page being open in a non-privatebrowsing window. But in the test we open a private browsing window and even verify that it has been opened before the failure is happening. I feel that the screenshot is from the wrong chrome window. David or Andreas, maybe you can answer that immediately without that I have to dig into Marionette code. Does Marionette take the screenshot from the currently selected chrome window or does it take it always from the original window?

(In reply to Henrik Skupin (:whimboo) from comment #3) > David or Andreas, maybe you can answer that immediately without that I have > to dig into Marionette code. Does Marionette take the screenshot from the > currently selected chrome window or does it take it always from the original > window? It takes a screenshot of the current window: https://dxr.mozilla.org/mozilla-central/source/testing/marionette/driver.js?from=marionette%2Fdriver.js#2550

It looks like that only the ru locale is affected by this bug for the last couple of days. I will have a look and check if this might be localization dependent.

No failure in the last 2 months. I'm going to close this bug as WFM.

ESR38 is still affected.

Firefox 38.xESR reached its end of life. No other official release will follow. I do not see a reason to fix this bug.