Hi im building an app, the final version will be for mobile phones, but for now I add scenes and images, then publish and and review in the FF browser.

Every time I work on the app, then publish and review, it seems like my images are displayed with less resolution. This suggests there might be some size limit, and in order to support more images it reduces the quality? Does this sound right? My fla file is currently 70 mb, and I'm only a 1/3 of the way done.
Is there a hard size limit? Can it be increased? Thanks