Playing with sandboxing in F2 by using an AMD plugin. The plugin uses a domain key to group apps.

F2: Sandboxing via AMD plugin

// Inside F2 library
// --------------------------------------------------------------------------------

// Override "define" to give us the appId inside the plugin
var oldDefine = define;
define = function(id, deps, fn) {
  // Append the appId to the dependency
  if (deps && deps instanceof Array) {
    for (var i = 0; i < deps.length; i++) {
      if (deps[i].indexOf('F2Sandbox!') === 0) {
        deps[i] += '|' + id;
      }
    }
  }
  
  // Pass through to the normal method
  oldDefine.apply(this, arguments);
};

// Make the plugin that will create new instances
define('F2Sandbox', {
  load: function(name, req, onload, config) {
    var parts = name.split('|');
    var domain = parts[0];
    var appId = parts[1];
    
    // Make sure the appId was loaded via the specified domain
    if (appIsFromDomain(appId, domain)) {
      req(['F2'], function(F2) {
        var domainInstance = F2.spawn(domain);
        onload(domainInstance);
      });
    }
    else {
      onload.error();
    }
  }
});

// AppClass
// --------------------------------------------------------------------------------

define('com_domain_foo', ['F2Sandbox!domain'], function(F2) {
  
});