Firefox Support Forum

Firefox version  : 55.0.3 (64-bit) EME Free Current addons / extensions : None - all removed

Problem: Full screen Video Stutters and Choppy - mainly on YouTube Html5 as well as on Twitch Html5. Occur only with Firefox on HTML5.

System Specs: OS  : Windows 10 Pro 64bit (OS Build 15063.463) CPU  : i7 3770S Mem  : 8Gb GPU  : nVidia 1030 GT

I got amazon prime. I go to play a video. It asks for me to install Flash despite the fact Firefox supports encrypted html5 video.

Is this supposed to happen?

I'm a musician and I need access to You Tube videos. I didn't have any luck on their forum, and the Firefox Forum rocks, so:

The You Tube videos only play after a complete computer restart. This is on Windows 7 on a Lenovo laptop.

All I get is the spinning circle. This occurs even if I just put the computer to sleep.

I'm using the HTML5 protocol.

Merely restarting Firefox does not help. Neither does using Internet Explorer.

I'd appreciate any suggestions.

Thanks!

Today when I started up my laptop, Firefox wouldn't play any YouTube video - the audio still works and the preview of the frame when seeking is there, but instead of video there is just a black screen. I have NO intention of installing Flash Player. Please help? Thanks in advance.

Hi (I don't know english good, sorry), I have a strange trouble with html5. It's started yesterday evening, after update 10.04.2015, I'm using FF Dev. Edition (aurora). Videos in html5 with H.264/mp4 showing as black retangle (example in attached). I trying own page with html5. It's not working too, but "Your browser does not support H.264/MP4." didn't written, just black rectangle. I'm trying ogg, and it's work. Before the update all worked fine, I have watched video in html5 only. Whats I doing wrong or it's bug from the last update? In FireFox (not aurora, not beta), I can watching html5 fine, all my codecs installed on PC. Thanks.

UPD1 : Patch 39.0a2 (2015-04-11), problem is actual yet.

So recently I built a PC. I installed firefox and cannot seem to get HTML 5 video working. I enabled webm in the config to at least get HD on youtube however without that I'd be stuck at it only loading in 360p. When I go to the HTML5 test page from youtube it has no check marks for H.264 and MSE & H.264. Not sure what the problem is. Firefox does HTML 5 fine on my old laptop. I moved my profile from my old firefox to my new firefox so that I would keep all my preferences and so on. Also I am on Widnows 8.1 N if that at all makes a difference.

Video playback is not working correctly on Windows 8.1 Pro and Firefox version 43.0.4. I've attached an error message I keep getting on YouTube. I get problems off and on playing video on Dallas Cowboys. com. MSN videos load very slowly and sometimes don't play at all. I've run them in safe mode so I don't think it is the extensions that I use. I have removed Ghostery and Adblock Plus. When I use Google Chrome all these sites load quickly, play with no errors even with Ghostery and Adblock Plus extensions running. What am I missing and how do I fix it?

When ever i watch videos i get memory leak, if that's the right word to call it, to avoid video lags i new use only 1 video Tab & not 2 like in the past, its just some sources are slow with loading, that why i use to use 2, awry time i click on next EP memory usage grows & awry time i click on full-screen it grows even more & larger number, depending source, some sources use RAM & some committed memory (but with both memory usage grows with each video), so far anime sources use committed & TV series sources ram, also there was talk that Firefox 36 will be free of Flash, that it goes over to HTML5, but i still see flash in my plugins & also all videos still use flash, with anime ram usage increases to a bit, but not as much as with TV series sources, when will the memory leak be fixed?

EDIT: lets just say it leaks memory when watching videos, its just worse in full screen, with TV series it doesn't matter full screen or not, still takes a lot of ram, well in the end of the day its a lot, starts from over 300MB & grows, some sources leak ram & some committed

all my adds, its for extra information

Adblock Edge, Enforce Encryption, Ghostery , More In Content UI +.

this are not known as problem creators, just in case some1 thinks i mite have bad adds

Running 37.0 Firefox on Windows 7 - 64 bit. All updates updated. Flash is 17,0,0,134 and checks out at Adobe site.

This afternoon YouTube videos stopped playing. In the center of the frame are circling dots. The video appears to have loaded, as I can move the time slider and see frames at the various times, I just does not play, just gives the circling "loading" dots. YouTube runs fine in IE. In Foxfire, if I go to other sites, like news and videos/ads play just fine.

I disabled all add-ons, set Shockwave & Flash to "always activate" and still the YouTube videos will not play. Seem to download, just not play.

Thanks in advance for any help.

The majority of videos I try to play all fail. A few short weeks ago everything on YouTube played fine, now it's more of a hassle than it is worth, trying to look at YouTube videos.

The majority of websites with embedded links to videos and embedded videos also mostly fail. As of now my Firefox will not play the majority of videos around the web.

Something has changed and I didn't hear about it - videos all of a sudden crashing and burning. Twitter videos will not play. Videos on Grabien.com all fail.

Cannot play a single HD video on YouTube using FireFox using HTML5 and Flash. The video stutters and then drops frames and an insane rate while the audio keeps going. I used to be able to play 720p 60fps videos on Firefox but even those drop frames now. I don't understand why since YouTube works fine on Microsoft Edge but I would much rather continue using FIrefox than that so some help here would be greatly appreciated. My specs (laptop): Windows 10 Pro 64-bit AMD E-450 APU with Radeon HD 6320 Graphics 1.65 GHz 4.00 GB RAM Wired connection.

Thank you.

Playing videos in the small or large player is fine, and 60fps videos look nice and smooth, but when I fullscreen, the video drops down to about 27fps no matter what quality it is, and the player itself gets really unresponsive while the video is playing. It takes several seconds to pause, and all the animations are very laggy. Strangely, when I unpause the video or pause using the spacebar, the video reacts almost instantly, but the animation in the middle of the screen is still laggy.

Note: Playback in chromium is fine, and hardware acceleration is disabled because when I enable it, it makes visual artifacting, tearing when scrolling, and extreme lag.

Debug info: http://pastebin.com/R8ajBpes

PC Specs: i5 4690k (integrated graphics disabled via BIOS), radeon hd 7950, eluctronics 500gb pro ssd, gigabyte z97n-wifi, linux mint 17.2

[EDIT]: At 1080p 60fps large player mode (theater) the player's animations will lag, but pausing/unpausing will respond immediately. In this mode the CPU usage ranges from 30 - 75% on each core, which is absolutely absurd, considering my hardware.

Every time I attempt to put Youtube into Fullscreen mode Firefox crashes. The only add-on I have is U Block. I've already run a fresh install of Firefox, and it still crashes upon trying to fullscreen. I am running Yosemite on a Macbook Pro 2010. Youtube works fine in the Safari browser, and all other video types (Silverlight for Netflix) work fine on Firefox.

I was watching Netflix fine last night, but now all of the sudden it's giving me this message when I try to watch videos:

> The Primetime Content Decryption Module provided by Adobe Systems, Incorporated plugin has crashed

I suppose Netflix is trying to use HTML5 instead of Silverlight, of course getting away from Flash only to come back to Adobe isn't that ideal.

The plugin is automatically downloaded by Firefox, so this is a Firefox issue: https://support.mozilla.org/en-US/kb/enable-drm

Anyway, I have "Play DRM content" selected in Options ==> Content. What else could fix this?

I have a quite low end system set up, so I'm not expecting miracles from it, but there seems to be some problems playing Youtube videos on Firefox.

If I load a video on Internet Explorer, it will play fine, even on 1080p with CPU usage of about 20%. Firefox often exhibits problems playing videos.

If I launch Firefox immediately from signing in, the videos will play fine. If I navigate to another video, there will usually be dropped frames and high CPU usage.

I understand that Internet Explorer will use the h.264 codec which is GPU accelerated whilst FF will use a more CPU intense task, but that doesn't really explain why sometimes the videos will play fine and others, it won't.

I have tried on a completely clean install of Firefox, so it will unlikely be extensions, profiles or add-ons. I have then changed the timing of the sessions saving and disabled smooth scrolling as advised elsewhere, with no success.

All help gratefully received.

Hello guys! I'm having some periodic crashes when i listen to youtube music in background. It happenes randomly, maybe once a week or sometimes twice a day.

I tried removing some unnecessary plugins but it didn't help.

Here are my logs in pending folder (or is there any way i can upload them in some readable form?)

https://drive.google.com/open?id=1nSkZKb2SSgUYPoNvrrBBYXNmoCugthPI

As the title says.

I have flash disabled so only play html5 videos. My firefox client is running only 2 extensions, ad block plus and greasemonkey, but this issue started before i had the latter and i don't think APB is doing this.

My firefox version is 43.0.4

I have an nVidia GeForce 9500 GT on a 32-bit Linux Mate 17.2 system. If I try to watch 1080p videos in a web browser, the videos are lagging, even when they're fully buffered. If I download the video and play it outside of a browser, it works fine, and if I play it within a browser on Windows it's also fine. The graphics card driver I have on Linux is the best one, and installed correctly, If I run this Linux via Live USB and go to Youtube in Firefox, I see the videos play in Flash player and 1080p works fine. If I try to play HTML5 video in a media player, it lags. How can I fix this?

Bonjour,

  having issue with flash and simple playlist shuffle handling by youtube I decided to give HTML5 a try.

Now, my playlist seems to be working good (most of the time anyway!) but after a couple of videos I end up with only a black screen within youtube but still hearing the music (at least!).

I am writting this because I had the same issue many, many months, if not years ago. I have deactivated Video Acceleration within Firefox which fix the problem for a little while (I can now see a couple of videos before I get the black screeen).

What is puzzling me is how come, years after youtube switched to html5, this problem is still around and not fixed!?

Is there any way to fix the issue!? Is this a Firefox issue? Youtube issue?

I'm running Windows 10 64bits, fully patched and latets release of Firefox.

Anyone else noted that in Firefox 37.01 HTML5 loads annoyingly slowly and the loading keeps sticking several times: in FF36 YouTube video of 4 minutes would be loaded in few seconds, in FF37.01 it takes half the videos length before loading fully.