Attempting to connect to the wiki at wiki.allegro.cc is blocked by the latest version of firefox (47.0 as of this post) because of the following security warning:

"Insecure Connection:

The owner of wiki.allegro.cc has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website."

Manually changing the URL to use the HTTP protocol instead of the default HTTPS (this is not a solution!) still shows the same warning.

The advanced section shows the following information:

wiki.allegro.cc uses an invalid security certificate. The certificate expired on Wednesday, June 15, 2016 6:59 PM. The current time is Tuesday, June 21, 2016 9:41 PM. Error code: SEC_ERROR_EXPIRED_CERTIFICATE

In other words, please update your security certificates!