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.

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A video I encoded for mp4 and built in HTML5 won't play on my ipad or iphone.
It plays fine on Safari on MacBook as well as Google Chrome on Windows7, both in the HTML5 player.
I have encoded the mp4 in a program called HandBrake using H.264 for video and AAC for Audio and the device set to ipad (I also tried iphone).
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.
I didn't examine your html5.html file. I take it you are not hand-encoding, but using a program that does that for you. Here is the html line I used to download one of your files:
<LI> <A HREF="http://timken.com/sites/momentoftrust/en-us/Documents/pr6.mp4">MP4 Test</A>
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Fred
Message was edited by: Fred*M.

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
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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.
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*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 <u>[[Safe Mode|Safe Mode]]</u> 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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Hi there,
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HTML5 videos won't play correctly with built-in player

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