Error when running example in Firefox

[wilcraig]

Error: Invalid isolate scope definition for directive chart: =?
$CompileProvider/this.$get</applyDirectivesToNode/nodeLinkFn/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:4196
forEach@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:117
nodeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:4142
compositeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3848
compositeLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3854
publicLinkFn@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:3763
update@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:13890
$RootScopeProvider/this.$get</Scope.prototype.$broadcast@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:8090
$RouteProvider/this.$get</updateRoute/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7250
qFactory/defer/deferred.promise.then/wrappedCallback@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6650
qFactory/defer/deferred.promise.then/wrappedCallback@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6650
qFactory/ref/<.then/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:6687
$RootScopeProvider/this.$get</Scope.prototype.$eval@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7840
$RootScopeProvider/this.$get</Scope.prototype.$digest@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7707
$RootScopeProvider/this.$get</Scope.prototype.$apply@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:7926
done@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:8933
completeRequest@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:9073
createHttpBackend/</xhr.onreadystatechange@https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js:9044

https://ajax.googleapis.com/ajax/libs/angularjs/1.0.3/angular.js
Line 5582