New answers tagged plugins
In addition to setting up the proxy under the Network settings, you may need to add an exception. For example, to properly use the QGISCloud plugin, you need to open your Computer's Internet Settings, Connections, LAN Settings, and and qgiscloud as an exception. This will allow your plugin to access the internet properly.
This is a classic script tag order issue. Make sure you load the Leaflet library (and possibly the Mapbox one too) before the associated plugins. Otherwise, the latter will not be able to find Leaflet definition and do their work. When your issue is very programming-related, feel free to ask on Stack Overflow, you would probably receive an answer much more ...
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