Why is the Firefox browser not recognizing ANY Flash player add-on?

I recently updgraded to Flash 17.0 and find that the browser often doesn't recognize my Flash player add-on. The crazy thing is that it's available in my list of add-ons, but whenever I enable and disable it, Firefox never recognizes that it's present when I go to sites that use the add-on.
I recently uninstalled the latest version of Flash and went back to an older version (10.3 I believe), and that still didn't change anything. I even did the little trick where you go into your "help", "Troubleshooting information" and "show folder" to delete "pluginreg" DAT, but it seems you have to do this EVERY new session on Firefox.
This is ridiculous. Flash is so often used on websites that I can't believe Firefox would upgrade its browser and not have something as essential as its compatibility with Flash all ironed out prior to the upgrade. I've read through the other answers to similar questions on here, and NONE of them offer any kind of permanent fixes. It'll all crap that you have to do manually every time you start a session on the browser.

Nope. I tried both things, and neither worked. I went through the work of downloading and installing both ActiveX version and the plug-in version. I then delete the plugin.dat after I closed out of my last season of Firefox.
It seems to work immediately after I do this, but if I disable Flash, at all, as I often do during most of my browsing and then enable it before I go to youtube, youtube still doesn't recognize the plugin and tells me I need to go download it.
It looks like I'm going to have to go and reset my plug-ins, but I REALLY don't want to do this. This is ''insane''.

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Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
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*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*'''''Shockwave Flash''''' (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

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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.
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Invoke the music player, Options -> Exit. It's the last one in the list
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Why is the Firefox browser not recognizing ANY Flash player add-on?

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