Hello,

Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.

Hi,

Thanks for the quick reply. Unfortunately I run FF pretty stock, no extensions. However I did start it in safe mode, but the video will not play at all in HTML5 mode, I have to switch back to a flash version.

I actually noticed, if I drag the raw .mp4 or .webm file directly into a new browser tab it just displays the separate L/R videos side by side so...I think this might not be a Youtube issue, but only either FF or video related now, since I can play the same exact file in the Nvidia 3D video player.

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: 25.0a1 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:25.0) Gecko/20130625 Firefox/25.0

Extensions

Name: FiddlerHook Version: 2.3.2.0 Enabled: false ID: fiddlerhook@fiddler2.com

Name: Norton Toolbar Version: 2013.4.1.2 Enabled: false ID: {2D3F3651-74B9-4795-BDEC-6DA2F431CB62}

Name: Norton Vulnerability Protection Version: 11.3.0.9 - 5 Enabled: false ID: {BBDA0591-3099-440a-AA10-41764D9DB4DB}

Important Modified Preferences

accessibility.typeaheadfind.flashBar: 0 browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.disk.smart_size_cached_value: 358400 browser.places.smartBookmarksVersion: 4 browser.startup.homepage_override.buildID: 20130625031238 browser.startup.homepage_override.mstone: 25.0a1 browser.tabs.warnOnClose: false dom.mozApps.used: true extensions.lastAppVersion: 25.0a1 gfx.direct3d.last_used_feature_level_idx: 0 network.cookie.prefsMigrated: true places.database.lastMaintenance: 1372172671 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true plugin.state.npuplaypc: 0 privacy.donottrackheader.enabled: true privacy.sanitize.migrateFx3Prefs: true storage.vacuum.last.index: 0 storage.vacuum.last.places.sqlite: 1372172672

Graphics

Adapter Description: NVIDIA GeForce GTX 660 Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 3071 ClearType Parameters: DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] DISPLAY2 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] Device ID: 0x11c0 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16492) Driver Date: 5-12-2013 Driver Version: 9.18.13.2018 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 10 Vendor ID: 0x10de WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 660 Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: false AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo

JavaScript

Incremental GC: true

Accessibility

Activated: false Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10 Version in use: 4.10

NSS Expected minimum version: 3.15.1 Basic ECC Beta Version in use: 3.15.1 Basic ECC Beta

NSSSMIME Expected minimum version: 3.15.1 Basic ECC Beta Version in use: 3.15.1 Basic ECC Beta

NSSSSL Expected minimum version: 3.15.1 Basic ECC Beta Version in use: 3.15.1 Basic ECC Beta

NSSUTIL Expected minimum version: 3.15.1 Beta Version in use: 3.15.1 Beta

For further troubleshooting, maybe try creating with a new profile (sorry i cant test the vid as i have limited internet and am using a lil weak intel chip).

http://kb.mozillazine.org/Profile_Manager