hello,
I have OS X 10.10.0_14A36c1 preivew and have installed 15.0.0.152 and Firefox 32.0.2 and am not having an issue viewing Flash content.
Using Firefox, please navigate to Flash Player Help. Click the yellow Check Now button. It should detect the version of Flash Player installed and displaying in the ensuing widget. There is also a Flash tree animation at the bottom of the page. I have also tested a few other popular sites that contain Flash content and was able to view the Flash video.
Please provide URLs to Flash content that is not displaying as expected.
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Maria