File Paths to load files with WWW for WebGL

Is there a restriction on where files can be loaded from when using the WWW object?
Should I expect the same behavior when I deploy to the server? I am testing using the Firefox browser console by double clicking on the index.html. > "C:\FileLoaderTest\build\html5" --> **This is where my WebGL build is deployed.** I placed an xml file in three different locations and used the following urls to access the files: *...inside the same directory as the index.html* > "file:///C:/FileLoaderTest/build/html5/TestFile.xml" --> **Loads as expected.** *...in the root directory* > "file:///C:/TestFile.xml" --> **Does not load.** *...in a sub directory* > "file:///C:/FileLoaderTest/build/html5/Config/TestFile.xml" --> **Does not load.**