Hello, Please see this Fix common audio and video issues

Flash Plugin - Keep it up to date and troubleshoot problems

Thanks for your request, but not work for me :(

You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

• Firefox > Preferences > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in 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

@ Cor-el: Thank you, after do that, problem solved. I'm still watching and waiting when it happen again.

Crashes or other problems with certain multimedia content in Firefox (such as Youtube videos and Flash animations or games) can often be resolved by performing the steps in these Knowledge Base articles:

• Flash Plugin - Keep it up to date and troubleshoot problems

• Adobe Flash plugin has crashed - Prevent it from happening again

• Flash 11.3 doesn't load video in Firefox

On Windows Vista and above, you can disable Flash protected mode by following the instructions on these pages:

• http://forums.adobe.com/thread/1018071#TemporaryWorkaround
• http://kb.mozillazine.org/Flash#Disabling_Protected_Mode_in_Flash_11.3

(See this Adobe blog post for technical details about Flash protected mode.)

Please tell us if this helped!

Guys!! my problem comes back today, i was clear cache and removed all cookies, restart in safemode, but not working. What i have to do now?

clip 3: https://www.youtube.com/watch?v=x444ZbMFxO4&feature=youtu.be

at 0:02 and 0:13

In order to be able to find the correct solution to your problem, we require some more non-personal information from you. Please do the following:

• Click the Firefox button at the top left, then click the Help menu and select Troubleshooting Information from the submenu. If you don't have a Firefox button, click the Help menu at the top and select Troubleshooting Information from the menu.

Now, a new tab containing your troubleshooting information should open.

• At the top of the page, you should see a button that says "Copy text to clipboard". Click it.
• Now, go back to your forum post and click inside the reply box. Press Ctrl+V to paste all the information you copied into the forum post.

If you need further information about the Troubleshooting information page, please read the article Use the Troubleshooting Information page to help fix Firefox issues.

Thanks in advance for your help!

Application Basics
------------------
Name: Firefox
Version: 27.0.1
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:27.0) Gecko/20100101 Firefox/27.0
Crash Reports for the Last 3 Days
---------------------------------
All Crash Reports
Extensions
----------
Name: Adblock Plus
Version: 2.5.1
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Name: Customizable Shortcuts
Version: 0.5.11.1
Enabled: true
ID: [email protected]
Name: Duplicate in Tab Context Menu
Version: 1.0.0
Enabled: true
ID: [email protected]
Name: FEBE
Version: 7.3.0.1
Enabled: true
ID: {4BBDD651-70CF-4821-84F8-2B918CF89CA3}
Name: FlashGot
Version: 1.5.5.98
Enabled: true
ID: {19503e42-ca3c-4c27-b1e2-9cdb2170ee34}
Name: Mozilla Firefox
Version: 1.1
Enabled: true
ID: jid1-zloetjqK02NhFg@jetpack
Name: Save Images
Version: 1.0.2
Enabled: true
ID: [email protected]
Name: Screengrab (fix version)
Version: 0.97.24c
Enabled: true
ID: {02450914-cdd9-410f-b1da-db004e18c671}
Name: YouTube Center
Version: 2.1.0
Enabled: true
ID: jid1-cwbvBTE216jjpg@jetpack
Important Modified Preferences
------------------------------
accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.places.smartBookmarksVersion: 4
browser.search.update: false
browser.sessionstore.upgradeBackup.latestBuildID: 20140212131424
browser.startup.homepage_override.buildID: 20140212131424
browser.startup.homepage_override.mstone: 27.0.1
browser.tabs.onTop: false
dom.mozApps.used: true
extensions.lastAppVersion: 27.0.1
font.internaluseonly.changed: false
gfx.blacklist.webgl.msaa: 4
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1398790819
places.history.expiration.transient_current_max_pages: 104019
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1415115537
Graphics
--------
Device ID: 0x a29
GPU Accelerated Windows: 1/1 OpenGL (OMTC)
Vendor ID: 0x10de
WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce GT 330M OpenGL Engine
windowLayerManagerRemote: true
AzureCanvasBackend: quartz
AzureContentBackend: quartz
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
JavaScript
----------
Incremental GC: true
Accessibility
-------------
Activated: false
Prevent Accessibility: 0
Library Versions
----------------
NSPR
Expected minimum version: 4.10.2
Version in use: 4.10.2
NSS
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSMIME
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSSSL
Expected minimum version: 3.15.4 Basic ECC
Version in use: 3.15.4 Basic ECC
NSSUTIL
Expected minimum version: 3.15.4
Version in use: 3.15.4

Can anybody help me please?

Wow,

You opened this thread almost a month ago. Sorry we haven't gotten back to you. It's been a busy week last week with the Firefox 29 launch.

Start Firefox in Safe Mode to check if one of the extensions (orange Firefox button, top left corner (The image "new fx menu" does not exist. for v29+)/Tools > Add-ons > Extensions) is causing the problem (switch to the DEFAULT theme: orange Firefox button, top left corner (The image "new fx menu" does not exist. for v29+)/Tools > Add-ons > Appearance).

• Do not click the Reset button on the Safe mode start window or otherwise make changes.

• Windows/Mac: Go to Help > Restart with add-ons disabled
• Linux: Run firefox -safe-mode in the Terminal/Konsole

Try to disable the YouTube Center extension and possibly reset all prefs by deleting the prefs.js file in the Firefox profile folder.

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)

See also:

• http://kb.mozillazine.org/Preferences_not_saved

@Moses , cor-el: thanks you guys for support, i tried but still not working :( safe mode, delete prefs.js file make firefox work nice in hours, then matter came back when i typing this post. And i notice same problem in flash animation banner, too. So i thinks problem is about flash, not in add-ons. Because my friend use other computer, and haven't any add-ons, problem happened in his computer, too. I don't want to use other web browser, but firefox is so annoying now.

I'm still wating for help. New video caught today https://www.youtube.com/watch?v=NfBwAUeQgOU&list=UUQZVDNfROWrYXeIBLwo_K8w (at 0:02, 0:03, 0:06)

New video 5 caught https://www.youtube.com/watch?v=iTIBdt3aKrg&list=UUQZVDNfROWrYXeIBLwo_K8w at 0:03 0:05 0:06 0:09 0:12 0:14 0:16 Need help