User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:44.0) Gecko/20100101 Firefox/44.0 Build ID: 20160123151951 Steps to reproduce: I signed up on addons.mozilla.org for an account there and received an email with a confirmation link afterwards. Account details: Nickname: GT-Schorsch Email address is similar. Sorry, I will not post my email address publicly. I emailed to webmaster [at] mozilla [dot] com and got a reply that I should file a bug report instead. Note: I had some problems choosing the right category here. My apologies. Actual results: The confirmation link does not work. It points to a 404 page. (I checked several times if I mistakenly copied the link wrong. I did not.) Expected results: Of course my account should get confirmed instead after clicking on the link.