Netflix won't go into full screen mode in Firefox.

I'm not sure if this is the right place to post this but anyways.

Nope. Neither NetFlix or Firefox are Apple products. Try the Firefox forums: http://forums.mozillazine.org/index.php?c=4

It does it with Safari as well. Go to Library/Application Support/Microsoft/...and DELETE Playready folder. Reboot and watch yer movie. I have also watched Netflix movies on my TV using component cables and ipad.(Mac comp cables with power plug)

exact same problem here - 2010 15" HD graphics mbp, plays in Safari but when attempting fullscreen in Firefox: flash of white, then screen goes black while audio keeps playing. Tried deleting FF/silverlight and all associated files and reinstalling several times - absolutely cannot fix this.

This is MOST CERTAINLY an issue with the Mac and not FF/silverlight - this is a brand new, clean install of OS X on a new computer. jafraga89, your observation about the graphics switching is a good lead - this "genius innovation" is likely the cause of the problem.

I have been having major issues with this computer (imovie kernel panic/crash when trying to capture files from camera harddrive, Windows virtual machine that was in sleep mode crashing/irretrievably corrupted after the VM woke up from sleep in a different graphics card than it fell asleep in, kernel panic/crash trying to install other apps). I ran a full hardware diagnostic that came up clean, so I did a clean OS X install and now this. I am also getting audio glitches/pops and horizontal lines across the screen while watching streaming netflix in Safari.

Majorly not impressed - i want to return this computer but i've had it for about a month now so technically too late...

I'm having the same exact problem coming from the same exact background. A data migration from my old macBook pro to a 2010 macBook pro, has caused the same Netflix viewing problems to a T. This must be some kind of universal issue, because the details of your problem are identical to mine. Has anyone had luck resolving this issue?

I have the EXACT same issue as well. It worked fine until I migrated data that was on a 24" iMac to my mbp. It will work if you go to system prefs and energy saver then uncheck auto graphics card switching. That is fine other than the lower battery life. I am thinking about creating a new user and copying just my files to the new user, not the backup files

I have what appears to be the same situation. Profile and programs for Silverlight moved from another computer for Netflix. Request for full screen goes to black screen w/ no full screen but sound. And changing to "Energy Saver", "Automatic Graphic Switching" to un-checked allows full screen to work on Netflix.

I was having the same issue (full screen playback wasn't working). In my case upgrading Silverlight (http://www.microsoft.com/getsilverlight/) fixed the problem. It now works like a charm, even with my dual monitor setup.

I have exactly the same issue with a machine I've had a little more than a month. I unchecked the automatic graphics switching in energy saver, but I still have the problem with fullscreen going black with audio running. I'm wondering if anyone has found a different solution or if there's a step I'm missing. the thing is, I'm smart enough to google my problem and try a couple of simple-seeming fixes, but I really don't know &#%^. could someone take a minute explain every last little step they took to solve this problem? it would be much appreciated...

@hettie - have you tried upgrading Microsoft Silverlight (http://www.microsoft.com/getsilverlight/). I had the same issue and upgrading this software fixed the issue.

I'm running the very latest Silverlight version on a brand new Macbook Pro (3 weeks old), but I'm still getting this. It works fine in Safari and Chrome - looks like a firefox specific bug to me.

Watching in Safari 5.0.3 worked for me.

Having the exact same problem, using Firefox. Fill screen does work in Safari, though. I'm getting tired of troubleshooting this and guess I'll just use Safari for Netflix...

miekBuk's suggestion of unchecking "Automatic Graphic Switching" in "Energy Saver" System Preferences worked for me.

I have had the same exact problem as the one in this post. Two of the posts are correct for me. Netflix did work in full screen mode in Safari as well as going into your system preferences/energy saver/ and unchecking the automatic graphics switcher worked perfectly.

It seems to me that the hypothesis about GPU switching holds some weight. I've been having this problem as well, and was quick to blame Microsoft and Silverlight. However, I've been experiencing some wonky behavior that seems to correlate with the graphics chips switching (i.e. random pixels lit on blank screens, etc.) I've taken my computer to the Apple Genius bar, and they told me that the logic board would need to be replaced, so that leads me to think that the GPU switching is potentially causing issues with Netflix. Does anyone know how Firefox interacts with the video driver? I would imagine safari is slightly more robust in that regard (to make pretty effects like CoverFlow work well).