If you were not trying to upvote anything, then go into the web developer tools and select the console. Repeat the process that triggered a prompt. You should

If you were not trying to upvote anything, then go into the web developer tools and select the console. Repeat the process that triggered a prompt. You should see what URL is triggering an authentication request. If that does not make it obvious, close the browser and start it in safe mode. Each browser [1][2] has it's own method of starting in safe mode to avoid loading any addons or custom code. [1] - https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-is... [Firefox] [2] - https://superuser.com/questions/254579/how-to-open-google-chrome-with-extensions-disabled-turned-off https://superuser.com/questions/254579/how-to-open-google-ch... [Chrome]