If you compare the two browsers' address bars, in the top image, the plugin notification icon is displayed. This is where you manage the page's permission to use or not use Flash.

In the lower image, the icon is not displayed, so either Flash is completely disabled or the site is trying (and failing) to use the native HTML5 player instead of Flash.

Flash Enabled?

You can test using: https://helpx.adobe.com/flash-player.html

If the page can't use Flash, and the notification icon does not appear, make sure Flash is set either to Ask to Activate (sites require approval to use Flash) or Always Activate (sites can use Flash without asking) on the Add-ons page. Either:

• Ctrl+Shift+a (Mac: Command+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. On the right side, look for "Shockwave Flash" and check whether any permission change is needed.

HTML5 Video Player Limitations

On Windows XP, Firefox cannot decode H.264/MP4 media because it requires the Microsoft components for that be installed, and Microsoft never released them for XP (only Vista and later). That's why it's important for pages to have the ability to switch to Flash...

You can try if the solution posted here works for you.

• http://www.msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

Good point! you saw that...In the lower image, the icon is not displayed

Flash works in comodo which i just uninstalled, Was thinking might be a conflicting with FireFox but still no luck.. I made sure FlashPlayer is on in Firefox 52 I'm thinking you may be right the website page is blocking flash player from starting for firefox Browsers ! I will keep working on it until I damage the computer LOL... is there any way to force flash to work on that web page? Should I uninstall Firefox & Remove it also 100% even in the " regedit registry" or do you think Firefox 52 will never work on those video's because it's block from the website error problem? or in About:config on Firefox 52 the codes are off..AMP PREMIER Videos? Keep in mind the FlashPlayer was tested at adobe website and it passed.But AMP PREMIER video's will not work anywhere I've check other wesites that has AMP Premier video same error no valid source code could be found. Thanks for your help....

opps forgot I did check whether any permission where change everything is set to Use Default looks okay adobe was not blocked still no luck.

I think your going to have to tackle the issue with the player maker as see all sorts of flash issues discussed here and more : https://community.akamai.com/docs/DOC-2334-amp-frequently-asked-questions There are links from that for support but must join to access the knowledge base and more.

Please let us know if this solved your issue or if need further assistance.

Try switching these settings, since Firefox on XP can't handle these formats anyway:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste mp4 and pause while the list is filtered

(3) Double-click the media.mediasource.mp4.enabled preference to switch the value from true to false

(4) Double-click the media.mp4.enabled preference to switch the value from true to false

Then do a reload of the page bypassing the cache (Ctrl+Shift+r). Does that help the site's player over to Flash?

jscher2000 said

Try switching these settings, since Firefox on XP can't handle these formats anyway: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste mp4 and pause while the list is filtered (3) Double-click the media.mediasource.mp4.enabled preference to switch the value from true to false (4) Double-click the media.mp4.enabled preference to switch the value from true to false Then do a reload of the page bypassing the cache (Ctrl+Shift+r). Does that help the site's player over to Flash?

You had my hopes up for a few moments!

QuickTime plugins dont work anymore in FireFox 52

Looks like AMP Pulled a Hillary did a bleachbit wiped with a cloth smashed it with a hammer It's done not even God can get it to work !!! "LOL"

Maybe I will install that out dated Comodo IceDragon again: or Just used Big Brother AKA Windows 10 I don't like it but it works !

What’s the browser compatibility of AMP?

   Official docs: Dropbox - AMPDeviceBrowserSupport.pdf and AMP - Device Compatibility https://www.dropbox.com/s/heqi0zehlhk5bbg/AMPDeviceBrowserSupport.pdf
   Browsers that support HTML5 with Media Source Extensions,  and therefore DASH
       Chrome any recent version
       Safari on Mac OS X Yosemite or later
       IE 11 or later
       Firefox TBD
   Browsers that support HTML5 w/o MSE,  and HLS
       Safari on Mac OS X last couple years
   Browsers that support HTML5 w/o MSE and w/o HLS, but MP4 Progressive Download
       Chrome
       Safari on MacOSX
       IE11  (older IE claims to but we see issue with HTML5 on earlier versions)
       Firefox on SOME machines (MP4 support is spotty)

===============================================

Windows XP is holding on until the end it was a great system to use! Thanks for the help !!!

Did you try to enable MP4 support as posted in my above reply?

• http://www.msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

This involves modifying some preferences on the about:config page. media.gmp-eme-adobe.enabled (boolean, true) media.gmp-eme-adobe.forceSupported (boolean, true; FF 49.0+) media.gmp-eme-adobe.visible (boolean, true; FF 49.0+) media.gmp.decoder.enabled (boolean, true) media.eme.enabled (boolean, true)

Modify media.gmp-manager.url : change %VERSION% to 51.0 (use 46.0 for Firefox 45 ESR)

• http://kb.mozillazine.org/about:config

Firefox 52.xx ESR users need to remove the Primetime plugin if it is currently loaded. You can delete the gmp folders (gmp and gmp-gmpopenh264) in the profile folder.

• Help -> Troubleshooting Information -> Profile Directory: Windows: Show Folder

jscher2000 said

Try switching these settings, since Firefox on XP can't handle these formats anyway: (1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful. (2) In the search box above the list, type or paste mp4 and pause while the list is filtered (3) Double-click the media.mediasource.mp4.enabled preference to switch the value from true to false (4) Double-click the media.mp4.enabled preference to switch the value from true to false Then do a reload of the page bypassing the cache (Ctrl+Shift+r). Does that help the site's player over to Flash?

cor-el said

Did you try to enable MP4 support as posted in my above reply?

• http://www.msfn.org/board/topic/175591-enable-mp4-h264-aac-html5-video-in-firefox-on-windows-xp-without-flash/

---

This involves modifying some preferences on the about:config page. media.gmp-eme-adobe.enabled (boolean, true) media.gmp-eme-adobe.forceSupported (boolean, true; FF 49.0+) media.gmp-eme-adobe.visible (boolean, true; FF 49.0+) media.gmp.decoder.enabled (boolean, true) media.eme.enabled (boolean, true)

Modify media.gmp-manager.url : change %VERSION% to 51.0 (use 46.0 for Firefox 45 ESR)

• http://kb.mozillazine.org/about:config

Firefox 52.xx ESR users need to remove the Primetime plugin if it is currently loaded. You can delete the gmp folders (gmp and gmp-gmpopenh264) in the profile folder.

• Help -> Troubleshooting Information -> Profile Directory: Windows: Show Folder

I did try just the mp4 in about:config with no luck after reading on I need to do much more then that. Looks like some fun work to be done might give it a try, But first would it just be easy to just install FireFox 50.0 version? I have many older version, which one would work?...see Image for more details ..

here is the image for other versions of FireFox which verison will work ?

That would be your choice. Note we do not advocate down grading.

If that fixes the issue then....... I also had to down grade once then update to fix the issue. So I will say go with what you think is best.

Please let us know if this solved your issue or if need further assistance.

Firefox 52.2.1 is the current ESR release and it should be fine to use that version.

Did you manage to install the OpenH264 plugin?

• "3-bar" menu button or Tools -> Add-ons -> Plugins