remote XUL no longer available in Firefox to set interface speed to broadband by internet provider
We had some problems with thunderbird lately and had to redo some settings. When resetting my email account on the server to 'Interface speed' from Simple (Dialup) to Advanced(Broadband) it comes up with the message: REMOTE XUL - this page uses an unsupported technology that is no longer available by default in Firefox. I have version 7.0.1
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Support for remote XUL was dropped a while back because it was a constant source of security concerns. If you find any website or application still using it you should report it as a bug to its developers.
There is a Remote XUL Manager extension which can be used to allow it to trusted sites on an individual basis if you really need it, but the only cases where this should legitimately come up are XUL code examples and some enterprise's internal software systems.