Yuotube HTML5 videos won't play on Firefox

I can't play Youtube HTML5 videos in Firefox, although I can in Safari. I just see a blank black rectangle, and nothing plays. No picture, no sound.
I have Firefox 3.0 and OS 10.9.3.
The add-ons I have running are:
adblock plus 2.6.4
autofil 3.6
autopager 0.9.0.10
classic theme restorer 1.2.1
colorful tabs 24.3
fastest fox 5.2.1
flagfox 5.0.5
flashblock 1.1.17
forecastfox 2.2.4
foxclocks 3.4.14
foxtab 1.4.9
image zoom 0.6.3
last pass 3.1.1
no squint 2.1.0
pdf download 3.0.0.2
pocket 3.0.5
troubleshooter 1.1a
userzoom survey tool 5.2.2.21
wot 20131119
xmarks 4.3.1
youtube mp3 podcaster 3.3.4

If you use extensions (Firefox/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.
Clear the cache and cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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MailOnline videos won't play in Firefox unless in safe mode although they're fine in Explorer.

It's for my mum, honest. Firefox 25, java and flash uptodate but the Mail Online videos won't play unless I start Firefox in safemode. A large white rectangle appears but nothing else.

You can try these steps in case of issues with web pages:
Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.
*Hold down the Shift key and left-click the Reload button
*Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
*Press "Command + Shift + R" (Mac)
Clear the cache and cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Certain youtube videos won't play in Firefox

Firefox 20.0.1, windows 7, flashplayer up to date.
Certain youtube videos won't play. The advert beforehand plays, and then the video just displays a black screen, no loading, trying to skip to a later time in the video doesn't work. It seems to be certain youtube users whose videos won't play, users whose videos I was able to watch only yesterday. The featured video on the user's channel is watchable, but not when opened separately.
IE won't show the affected videos either.

In addition to these symptoms, I've noticed that I can view these troubled videos on my cellphone just fine, but neither my XP or Win7 machine, which have all software updated can view. So if it was on youtubes side, it wouldn't work on my phone either.

Embedded Video won't play in Firefox

I have a youtube video embedded on a website. When played in
IE it's fine, but when played in Firefox the entire page gets
replaced by this error:
Not Found
The requested URL /embed src="
http://www.youtube.com/v/F6ADdUEJJ_E"
type="application/x-shockwave-flash" wmode="transparent"
width="425" height="350"></embed></object> was not
found on this server.
Additionally, a 404 Not Found error was encountered while
trying to use an ErrorDocument to handle the request. "
I do have the newest Shockwave for FF installed on my pc
(10.x) and I've been told that it's not just my FF that it crashes
in.
Here is the link to the video:
www.bmxradio.com/multimedia.html
here is the code I used in Dreamweaver:
<a href="embed src="
http://www.youtube.com/v/F6ADdUEJJ_E"
type="application/x-shockwave-flash"
wmode="transparent" width="425"
height="350"></embed></object>">
<object width="425" height="350"><param
name="movie" value="
http://www.youtube.com/v/F6ADdUEJJ_E"></param><param
name="wmode" value="transparent"></param><embed src="
http://www.youtube.com/v/F6ADdUEJJ_E"
width="425" height="350" type="application/x-shockwave-flash"
wmode="transparent" movie="
http://www.youtube.com/v/F6ADdUEJJ_E"></embed></object>
Any ideas?

What is the scripting error? Object not found? Did you upload
the Scripts
folder?
Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
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==================
"jamo1616" <[email protected]> wrote in
message
news:f2d0kk$50l$[email protected]..
>I am having the same issue but the opposite. When I embed
a youtube video,
>it
> will play in Firefox, Safari, Opera - but will not play
in IE.
>
> I have tested on several different PC's and it just has
a red X and says
> there
> is a scripting error.
>
> Here is my code:
>
> AC_AX_RunContent(
>
'width','328','height','267','wmode','transparent','src','
http://www.youtube.com
> /v/tj1fNc4wytc','movie','
http://www.youtube.com/v/tj1fNc4wytc'
); //end AC
> code
> </script>
> <noscript>
> <object width="328" height="267">
> <param name="movie"
> value="
http://www.youtube.com/v/tj1fNc4wytc"
/>
> <param name="wmode" value="transparent" />
> <embed
> src="
http://www.youtube.com/v/tj1fNc4wytc"
width="328" height="267"
> wmode="transparent"></embed>
> </object>
> </noscript>
>
> Thanks in advance for any help.
>

HTML5 videos won't play correctly with built-in player

1) When I try to play html5 video, firefox only shows me a few frames, and then screen become grayed and «loading» animation appears. Then it shows me next few frames, and a loading screen again. It continues until the whole video will load.
2) When it finally loads, video and sound are a little bit choppy if the video is in good quality. Other browsers play that videos without any lags or loading screens. Here's the example of one of that videos I couldn't watch normally: https://m.vk.com/video-51189706_170637645
I've looked up at memory indicator, and it showed me that I have at least 200Mbs of free RAM during the loading of these videos. Also every memory limit setting in about:config is set to -1.
I use the latest firefox version from Play Store and own an Asus TF300T tablet (nvidia tegra3 and 1Gb of RAM), so it's certainly not a lack of hardware power.
I also should note that when I watch youtube videos (with firefox, not youtube player, which I've removed), everything is fine — videos are playing and loading at the same time.

I cannot view that video however we are in the process of making some major changes to video playback on Android. Currently these changes are in our Aurora build of Firefox it can be downloaded at https://aurora.mozilla.org if you would like to see if this improves the video playback.

HTML5 Video won't play in Safari, when frameset used

I'm the Product Manager for a company who has a product that revolves around video. We've noticed that while we can get the HTML5 video capability in Safari on the iPad working fine in a test harness, as soon as we place that harness in the simplest of framesets (with the video area clearly visible), the video's "play" command no longer works. Oddly enough, the video object's properties can be read/written, but it appears that the "play" function itself does not work (and presumably the pause and load functions). The frustrating thing is that the video does appear to be loading - if you change currentTime to a different position, you can see the video frame at that position. The media just won't play.

...also, when I use the video's tags "controls" (shows player controls within the embed), Play/Pause DOES work. So, it appears to be a bug with the scripting layer.

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A video I encoded for mp4 and built in HTML5 won't play on my ipad or iphone.
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URL is timken.com/sites/momentoftrust/en-us/documents/html5.html
The video is at timken.com/sites/momentoftrust/en-us/documents/maddy_ipad.mp4
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Slamb0513-
The video you have at the html5.html URL is different from the other, but it also plays when downloaded and transferred to the iPad.
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Fred
Message was edited by: Fred*M.

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A Quicktime video plays perfectly when viewed on Safari, but in Firefox the video is blank. It plays, but only with sound. What do I do?
Here is the page:
http://web.mac.com/steverou/MyWeb_Page/LegitReel.html
Thanks for the help.
Steve

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http://www.wyodor.net/iFrame/
http://www.wyodor.net/_Demo/html5/HTML5Video.html
http://www.wyodor.net/Tutorials/ImageWidget/ClickMovie.html
http://www.wyodor.net/MoreEmbed/
http://www.wyodor.net/iWebBlogTest/Wyodor1/archives/2009/05/entry35.html
I explore all the possiblities and pick the one that suit my needs.

Videos won't play in firefox but will in chrome

Have found the solution to my problem, switched to google chrome end of problem.

hello, if you just want to leave feedback you can do so at https://input.mozilla.org/feedback ...
in case you want to troubleshoot the issue in firefox we might need a bit more information of what's going wrong. what happens when you try to play videos - are there any error messages? in addition, could you go to the firefox ''menu ≡ > help ? > troubleshooting information'', copy the contents of that page and paste them here into a reply on the forum? this might give us more of a clue what is going on...

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*https://support.mozilla.org/kb/flash-113-crashes

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=aw

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Yuotube HTML5 videos won't play on Firefox

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