Firefox no longer plays QT movies

Firefox no longer will play any QuickTime movies. If I try to play an embedded QuickTime movie on any page, Firefox displays a bar at the top saying, "Additional plugins are required to display all the media on this page." I have no problems in Internet Explorer. If I click the "Install Missing Plugins" button, it says the "Apple Quicktime" plugin is available. When I go to the next page of the prompt, it says it's "not available" and links me to download QuickTime (which I already have) from Apple. I've already tried re-installing QuickTime. It did not help.
I currently have QuickTime 7.6.4. Everything worked fine before two updates ago when I updated iTunes and QuickTime together, then immediately had problems. A family member helped me fix a problem causing me to get an error message each time I started the computer saying it couldn't find "iTunes Helper Application." I fixed a problem on my own where QuickTime files no longer had their distinctive QuickTime icons, but a generic Windows-doesn't-know-what-file-type-this-is icon. My PictureViewer also wouldn't open, but now mysteriously does.
My theory is that somehow Windows forgot where certain QuickTime files are whenever it updated that time. I'm guessing somehow it forgot where the QuickTime plugin for Firefox is. But I do not know how to fix this. Any help would be appreciated.

It might be worth trying an update to QuickTime 7.6.5, jmv. Certain issues relating to the way QuickTime handles playing movies in web browsers were addressed by that update, and the 7.6.5 update also contains a newer version of *Apple Application Support,* which contains a number of dlls used by QuickTime:
http://support.apple.com/kb/DL837
Do you have any better luck with a 7.6.5 in place?

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I can no longer play quicktime mov files from a canon firestore

I can no longer play quicktime mov files from a canon firestore from an HDV camera that play on other macs and play in vlc. It happened all of a sudden. Files that I could play before no longer play. It seems to be something wrong with the quicktime codec management because the files do not play in premiere and final cut pro. In FCP it says: File Error: 1 File(s) recognized, 0 access denied, 1 unknown. These files work on other computers. I have four drives and it doesnt matter which file i attempt to open on each drive, these files are unreadable on this system. Please help. Possible issues might be a corrupted index, but i dont understand how that can go across four different drives.
Model Name:          Mac Pro
Model Identifier:          MacPro4,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.66 GHz
Number Of Processors:          1
Total Number Of Cores:          4
L2 Cache (per core):          256 KB
L3 Cache:          8 MB
Memory:          8 GB
4 SATA drives

Apple kindly updated Quicktime and rendered Firestore files unplayable. I think a recent update of iTunes was the culprit.
Solutions: What I did. Wipe the system disc. Re-install Snow Leopard. Re-install FCP7. Don't update Quicktime or iTunes to anything after Jun 2011. QT v7.6.6 is the last good version. That'll get your files back.
A colleague tried a different approach. For this you need a pre-July 2011 version of the file QuickTimeComponents.component. It is in the system/library/QuickTime folder. Delete your current one and drop in an old one.
However if you're working with Final Cut X, I think you screwed until Focus and Apple work something out. My address is on my contacts page at teevideousadotcom if you need any further help.

ITunes 10.5.1 no longer plays purchased movies

Hello guys/gals,
So this is a problem I've been struggling to find an answer for and I've not gotten desperate enough to pay $30 for the one-time incident fee, YET. Currently own a Macbook Pro w/ i7 core. Running 10.6.8 (Snow Leopard) and iTunes 10.5.1. I've noticed recently that my purchased Movies no longer work. I purchased Hurt locker and Truth in 24 some months ago (honestly probably about a year ago) and I am no longer able to play these movies. I read elsewhere that our WIndows counterparts were struggling with Quicktime and that is why iTunes would fail to play videos. This confuses me because allegedly 10.5.1 now comes with Quicktime X with it. So I removed my old Quicktime 7.7 from my computer thinking perhaps it is a failure in the dependancy. Alas, to no avail. So I have come to ask for your infinite wisdom and perhaps shed some light on what may be the problem, if others have the same problem, and whether there has been a solution identified?

They did try to help but nothing worked. Tried deleting the movies from iTunes and then reinstalling them from my "purchased list" but some of the files were missing. They have no idea how that could have happened. Ironically all of the movies still work on a previous veraion of iTunes on my older mac. Go figure !!
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ITunes no longer plays downloading movies!?!?

Okay so on the last two movie files I've downloaded from the iTunes store, I've had to wait for them to completely download before they will play at all. It used to be that I could play the movie as far as it was already downloaded. Now, when I click play it goes to a black screen (as if the file started to play but nothing is happening - the play button turns to pause, again as if the file is playing, but the time index does not progress). I can manually seek and see individual frames of the movie (as if paused) but I still cannot get them to play from any time index position (even though I can see the frame).
Perhaps this is simply something that no longer works in the latest version of iTunes but if so then that's quite dissappointing.
I recently upgraded to Lion and I suspect this may be a factor (I don't remember if iTunes was updated at the same time or not). To be honest, so far I'm not at all impressed with Lion - it's quite a bit slower and glitchier than what I've come to expect from Apple (but hopefully there will be patches soon).
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iTunes: 10.4
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The iTunes Store Movies FAQ still says:
Can you begin playback while the movie is downloading?
Yes. How quickly playback begins depends on the on the speed of your Internet connection.
http://support.apple.com/kb/HT1906#faq24
Mac OS X 10.71 was released this afternoon. Run software update again. Maybe it will help.

Firefox no longer plays vines or twitter gifs

After I updated to version 35.0.1 I noticed that vines, both on twitter and on the vine site, and animated gifs in twitter no longer play. The gifs never even show up, and the vines load but can't play. Checked both in Chrome and they worked fine there.
Restarted in Safe Mode with all addons disabled but no luck. All extensions/addons are up to date. Switching media.windows-media-foundation.enabled back and forth does not fix.

''guigs2 [[#answer-686470|said]]''
<blockquote>
Hi, I understand that gifs will not play on vine.co and other sites.
When you changed the about:config entry media.windows-media-foundation.enabled, please restart Firefox and load the website bypassing the cache:
Reload the webpage while bypassing the cache using '''one''' of the following steps:
*Hold down the ''Shift'' key and click the ''Reload'' button with a left click.
OR
*Press ''Ctrl'' + ''F5'' or ''Ctrl'' + ''Shift'' + ''R'' (Windows and Linux)
*Press ''Command'' + ''Shift'' + ''R'' (Mac)
Let us know if this solves the issues you are having.
</blockquote>
Thanks! I switched media.windows-media-foundation.enabled back to True, which is default and restarted Firefox. I loaded a vine page from the address bar history and it started playing. Tested twitter gifs and they load too. All good to go!

New version of Firefox no longer playes videos on my website

Have no problem playing them on IE, Safari and Chrome.
Used to play on prior versions of Firefox.
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When I load a page (in this case, the 150-mph serve page, I get 3 errors in Firefox's Error Console. (Also, the video does not play.)
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Firefox no longer plays embedded YouTube videos - message "An error occured, please try later"

I've updated FireFox, cleared cache etc., but continue to experience this issue on several different sites where I have embedded YouTube videos. This issue has only just started happening - all was well a few days ago. They play fine with Chrome and Safari and I can also play the un-embeded version on YouTube in Firefox.

Yes, unfortunately, another user reported this a few days ago on his website.
Currently the only workaround is to click the YouTube button in the player to launch the video in a new window, and then manually edit the -nocookie out of the address and press Enter to load it on the real YouTube site.
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JustAnswer has asked me to answer your question -- installed a bluetooth headphone. works but firefox no longer plays sounds through my speakers. uninstalled bluetooth -got interent explorer to play sounds but not firefox.

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Do you have any tips out suggestions for when ADE can't download the epub book from an ACSM file? The problem seems to be related to something blocking the process, but no one has a clue as to the source of the problem. See my post fot more information:
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HT204370 My movies no longer play after upgrade

Can someone please help? I upgraded my computer to Win 7. Since the upgrade I can no longer play my movies that I bought through the itunes store, nor can I sync them onto my ipod classic. I have been watching these movies on this same Ipod for years. When I try to play the movies through itunes, it just shuts down with an error. I have reinstalled itunes. I have reset and restored my ipod. Still no luck. I have searched the internet and this seems to be a common problem, but no one has a solution. Do anyone here have one?
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Let's try the following user tip, just in case:
iTunes for Windows 10.7.0.21: "iTunes has stopped working" error messages when playing videos, video podcasts, movies and TV shows

After upgrading iTunes I can no longer play my songs. It says that "The song ________ could not be used because the original file could not be found. Would you like to locate it?" I have NO clue where to look.

After I recently Upgraded iTunes I can no longer play any movies or songs. It says that "The song ______ can no longer be playe because the original file cannot be found. Would you like to locate it?" I have no clue where to look as I'm not tech savvy. I did look in previous itunes libraries file and it's empty. Any and all help is appreciated.

The links below illustrate how your iTunes should look if you use default settings in preferences. If you don't use those settings then you have to know what you're doing.
Image of folder structure and explanation of different iTunes versions (turingtest2 post) - https://discussions.apple.com/message/13025536 and https://discussions.apple.com/message/17457605
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Quicktime 7.2 will not play Quicktime Movies

Ironic isn't it.
I recently purchased Sony's Movie Studio and it required a new(er) verson of Quicktime to import QT movies. So I download 7.2 ( i had 7.01, if I remember correctly) and installed it. I can now import QT into Vegas for editing. Fine. Great.
BUT, and here is the ironic part, Quicktime will no longer play Quicktime movies! Not .mov, .mp4, nothing. Zip. Zilch. But it will play some old avi files for some reason. All I get is the audio and flashing striped colors. Until 7.2 I could load any .mov, avi, mp4 file and edit them without a problem. (I forgot to mention, I had QT Pro) I was also using Any Video Converter to convert old home movies I'd burned to dvd to the mp4 format, and Quicktime worked flawlessly to open them too. Up until this "update" I've been very happy with the performance of Quicktime.
Now, nothing but frustation and the online Support hasn't pointed to a solution. And yes, I have updated my Dell PC running XP to all the latest service packs.
Any ideas? If I delete 7.2 I could probably re-install a version of 6 Pro that always worked, but then Vegas Movie Studio won't work. Kind of a Catch-22. Thank you for any help.

It has helped some who have had this problem. Try dragging the QuickTime webplugin folder to the desktop in case you need to put it back and see.

A movie I bought a while ago will no longer play, instead it just shows a black screen and no audio. All of the other movies in my library play fine. Any ideas as to whats going on or how to fix it? Thanks for any help.

A movie I bought a while ago will no longer play, instead it just shows a black screen and no audio. All of the other movies in my library play fine. Any ideas as to whats going on or how to fix it? Thanks for any help.

Hi 22chill,
I recommend that we delete and re-download the movie from your purchase history:
Downloading past purchases from the App Store, iBookstore, and iTunes Store
http://support.apple.com/kb/HT2519
Thanks,
Matt M.

Movies no longer play in iTunes or ATV

I installed the software update for iTunes 11.1.5.5 and now movies (m4v from Handbrake) stored on my PC no longer play in iTunes or Apple TV. These have been playing fine for years, so I'm guessing that 11.1.5.5 has something in it that suddenly doesn't like this format anymore. I can still see my whole library in ATV, covers and all, but when I hit play, I just get the spinning icon. In iTunes, it's just a black screen with the timer staying at zero. Music still plays fine on both devices. I'm frustrated at myself to no end for installing the update. As well, I cannot fine a single complaint of this same issue. I'm hoping that might be because there's a simple fix (long shot I know). Anyone else having issues? Any ideas? Please remember that this file format has been playing without issue for years, so please don't suggest that I change the format unless you know for sure that is a new concern with playback. Thank you.

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I bought a Sandisk Connect Media Drive, downloaded the app from iTunes. Before iOS 8, movies played fine. After iOS upgrade I can no longer play movies downloaded from iTunes to the media drive. Anyone else have a similar issue?

I bought a Sandisk Connect Media Drive, downloaded the app from iTunes. Before iOS 8, movies played fine. After iOS upgrade I can no longer play movies downloaded from iTunes to the media drive. Anyone else have a similar issue?

I checked with SanDisk's own online support and they indicate that they have notified Apple of the issue.
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Here is a crazy problem. My home movie will no longer play in iTunes.

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The lack of a purchase date, although I am not quite sure why it happens, does not in itself prevent the track from being authorized and played. However, since the account name is correct and they have disappeared from your purchase history, something may have been corrupted.
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Firefox no longer plays QT movies

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