The Firefox development community were fantastic. After all my talk of slaying dragons, they exuberantly got back to me and let me know that it wasn’t a bug at their end that stopped ActiveInbox connecting to our servers in Firefox 20.
Instead, they’d tightened their conformance to a Web specification, the only browser to do so (Mozilla, the company behind Firefox, believe deeply in an open, standards-based Web). And our website fell foul of the new specification.
I’ve since corrected the problem, and everything is working fine.
This post was written by andymitchell9496