When typing the password in Firefox,
it shows a "Not Secure" warning which was
hiding the "#get_api_key_button". You can see
the screenshot of it in #17136.
This commit fixes that issue by focusing on the button.
This commit works around an issue with Puppeteer tests on Firefox
where `page.url()` does not show the URL fragment, by adding a
temporary function that solves the issue.
Anders Kaseorg
Riken Shah