Some MP4 Videos are Crashing Firefox 37 in Fedoa Linux

This Video - Apollo 13 "Houston, We've Got A Problem" NASA Free Download and Streaming Internet Archive (".Mp4" version) Crashes Firefox 37 in Fedora 14. But, the ".Ogg" version plays, just fine. Firefox in Fedora 14, has been crashing allot, for a couple of weeks, on many videos. Not just this file or on Archive.org. I tried starting Firefox in Safe Mode. Which disables, all Addons. But, that was no help. I tried turning off some Plugins. VLC and Open H264 (No Help). And I turned off both Flash Players that I have (No help). Not that MP4 Videos are Flash Files. But, some Online Video Players, use Flash to make them work. What ever the Video File Type. And I know, that Archive.org, uses both Flash and HTML 5 Players. You can switch between them. But, I have been sticking with the Flash Player. Because I have had trouble with their HTML 5 Video Player, not working. On my own Music and Video Files, that I have on Archive.org (Christian Music Underground (CMU). Reminder - I should try switching to HTML5 on this video in Fedora 14. I have both Adobe Flash Player. And an Open Source Flash Player, called Lightspark. On my Fedora 14 and Fedora 20 Systems. I use the Fedora 14 system allot. Because, it has all of the Apps, that I spend years finding, installing and so on... I just uninstalled the old Gnash Flash - SWF file Player. To see if that helps (No help). I'll try playing this video, in newer versions of Fedora 20 (works perfectly) and 21. See if it crashes them too. I could try "The Refresh Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Consider using it before going through a lengthy troubleshooting process." But, this will Delete all of my Firefox Addons. I did Back them up with the Export App, Addon. But, I hate to go through all of that,and have to reinstall all of my Addons. If I don't have to... I have Hardware Acceleration, turned of in Firefox in my Fedora 14 System. So, that's not a problem. See the reference links, below, for more info...

Don

Go there...
https://archive.org/details/apollo13_houston_weve_got_a_problem

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Go there...
https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems#w_start-firefox-in-safe-mode

Project URL : http://www.adobe.com/downloads/

Adobe Flash Plugin 11.2.202.440
Fully Supported: Mozilla SeaMonkey 1.0+, Firefox 1.5+, Mozilla 1.7.13+

Project URL : http://lightspark.sourceforge.net

Lightspark is a modern, free, open-source flash player implementation.
Lightspark features:

* JIT compilation of Actionscript to native x86 byte code using LLVM
* Hardware accelerated rendering using OpenGL Shaders (GLSL)
* Very good and robust support for current-generation Actionscript 3
* A new, clean, code base exploiting Multi-Threading and optimized for
modern hardware. Designed from scratch after the official Flash
documentation was released.

Project URL : http://github.com/leamas/lpf

Bootstrap package allowing the lpf system to build the non-redistributable
flash-plugin package.

The flash-plugin package is available only for i686 and x86_64 systems.

Project URL : http://projects.gnome.org/totem/

Totem is simple movie player for the GNOME desktop.
The mozilla vegas plugin for Totem allows it playback flash videos
on some popular video websites.