Firefox 33.1 does not load Adobe Flash Player 15.0.0.223

Question

As far as I can determine, Firefox 33.1 does not load Adobe Flash Player 15.0.0.223 (identified on the Plug-ins list as "Shockwave Flash 15.0.0.223") when I access most of the pages on the MSN website. Whether it will display any specific video is unpredictable but it displays about one out of five.
If I place the mouse cursor on the blank black video display area (for which no controls or buttons are displayed), and click the right mouse button, then either (1) the context menu is the same as for clicking the mouse cursor on an empty part of the page, or (2) the context menu is not displayed at all.
Apparently, Firefox has failed to load the plug-in, but does not display any error message. Neither is there any error message displayed by the plug-in.
If you think I am willing to undertake a trial-and-error odyssey through various "do this and see what happens" recommendations in "Knowledge Base" articles and the like, then think again. I don't have the time to make the effort, and I will use Internet Exporer instead. It ought to work with MSN just fine. :-)
Since I did not develop Firefox, this is not my problem to solve. It's your software, not mine, and I didn't make the mistakes, so you fix it.
By the way:
Either Firefox Help does not display the version correctly, or your Troubleshooter doesn't obtain the data correctly. Help says version 33.1 and Troubleshooter says 33.0. YES I KNOW THAT FIREFOX 33.1.1 IS AVAILABLE. SO WHAT?
Troubleshooter also identifies the Shockwave Flash plug-in as "15.0 r0" but the native Add-ons feature identifies it as 15.0.0.223 -- which is the version that Adobe uses.
The last line of the Troubleshooter's "educated guesses" just has "* 5.1.30514.0". I have no idea as to what that refers to and I doubt that anyone else would have one either.
Well, maybe those numbers are good enough for "educated guessers" but in my experience computers do not make "educated guesses" even if software developers do.
Enjoy!

Answer 1

Please refrain from posting scattergun boilerplate suggestions.
Please post specific instructions that will resolve the problem. If you don't know why the problem occurs and how to remedy the problem, then don't bother.
Realize that the problem did not occur with the previous version of Adobe Flash Player, but began after it was updated to 15.0.0.223. So it is is apparently specific to that version, and it may reflect a flaw in Adobe Flash Player. There's no way to actually report it to Adobe. Posting a report in their "user forum" just produces replies like the one that you have posted in reply to my OP, so what is the use?
Evidently you presume that Firefox does not have a bug, that something else doesn't work and you may be right. However, if Firefox does have a bug, then nothing that you have posted will correct it, and experimenting according to your boilerplate will be nothing but a waste of time and effort.
Again, the problem is not that Adobe Flash Player 15.0.0.223 does not run, but that it does not run when I attempt to view most of the videos on MSN. It does display videos from YouTube and other websites with an occasional specific exception. If the failure occured on more websites, and with all MSN videos, then maybe your suggestions for investigating it would have more merit.
For what it is worth: the problem occurs in Firefox Safe Mode and without Firefox Safe Mode. Disabling or enabling any extensions or other plug-ins has no effect.
I established that while investigating why Firefox 33.1 started producing crash reports every time that it initially displayed the New Tab page when I visited MSN (Firefox 32 did not do that). I also checked whether the actions that I took to troubleshoot that behavior affected Adobe Flash Player on MSN. They didn't.
Apparently the crash reports occured because Firefox could not find or could not load the "thumbnail" images for website pages that I had previously seen (they are often deleted by ''CCleaner''). The crash reports stopped after I made a couple of changes to the configuration for the ''SandboxIE'' sandbox in which I run Firefox.
Frankly, Firefox "Safe Mode" is something I don't need, because I run Firefox in a ''SandboxIE'' sandbox, which is a much more comprehensive security measure than anything implemented by any specific application. At the moment I don't recall whether Firefox Safe Mode is enabled, although I probaby re-enabled it after disabling it during the crash-report investigation. But it didn't make any difference with regard to Adobe Flash Player in that context, so there's no reason to repeat it.