That looks to be an error on the part of Firefox. Firefox has had security related issues since version 3.0, issuing false alerts and sometimes outright denying access to sites that use self-signed certs. In both cases, there's no danger to the user, but it does create obvious confusion. Great browser, I use it daily, and have for probably 7 years now, but it's not without its quirks and shortcomings. The self-signed SSL is the entire reason I now use Chrome daily, in addition to Firefox.
On this site, all Paypal transactions are directed to the Paypal.com https.
- The donation page is simply linking to Paypal.
- And the forum "checkout" is using a standard payment gateway API (the payment is sent to Paypal, and then Paypal confirms payment before the forum software creates the upgraded account).
As we've written before in other threads on the site
, it would be easier to knock over a liquor store or gas station, compared to trying to steal money through a website. We're in no way trying to phish, steal information, send spam, etc. To be quite honest, something like that is really outside our technical expertise level. This site is here to help people like you, on the topics of digital media (video, photo, web/print publishing).
The error could be safely ignored.