Board Thread:Support Requests - Getting Started/@comment-87.178.111.34-20160819090137/@comment-26143371-20160820071118

I don't have this problem, but if I did, I'd try the following things: Depending on the outcome this might be a case for C/B or it might not.
 * 1) Using Special:Signup directly, thus circumventing the popup.
 * 2) Making a new firefox-profile without any customisations or cookies.
 * 3) Trying another browser like Chrome.