Animation Playhouse Mozilla Released Beta 4 of Firefox 3.6 late Wednesday afternoon. Mozilla Links’ Percy provides this brief review: As expected, a fourth beta for Firefox 3.6 is now available, this time it adds support for HTML 5 file API, which enables some new insteresting functionality: for example you would be able to load a bunch of local images to a web app without actually uploading them to the server. You would be able to edit them locally, save them locally, and optionally upload them once they are ready. The Beta of Firefox 3.6 / Gecko 1.9.2 introduces several new…