Dave-H

I suspect that the reason why some videos on YouTube work for you and others don't is that older ones still have a Flash fallback available, and newer ones don't. If you right click on a video that's working and the Flash plugin menu comes up, that would confirm that. As to why the system isn't working as it should for you, all I can suggest is that you go through this thread and double and triple check that all the necessary settings are present and correct in about:config, and that the necessary files are all present in the <Firefox Profile>\gmp-eme-adobe\17 folder. There should be three files there, eme-adobe.dll, eme-adobe.info, and eme-adobe.voucher. It's far more likely that a setting is missing or wrong though. HTH.

OK, no problem, I'm sure the failed update will soon be superseded by another one, indeed perhaps next week! I hope that whenever the next one is that it does install OK for you. Strange to have a failure with no reason or error code given though. Cheers, Dave.

@roundball Sorry for the delay, but this is the Windows 10 update history list I was referring to. Your failed installed of the Office 2010 update for Outlook should be listed there (as mine is) with an error code if it failed. I do realise this Windows 10 stuff is off-topic here!

Thanks, that's good to know! Firefox 52 ESR is absolutely fine at the moment, but the time will come of course when it won't be, so I hope the option to switch to something more up to date on XP, and continue to use Sync with my other Firefox installations, will still be there then!

FWIW, the reason I'm still sticking with FF 52 ESR at the moment is that I want to use the Mozilla Sync system to keep things like my bookmarks and passwords synchronised with my other devices, where I have FF 69 installed, like my phone and other Windows installations. I'm not sure how compatible any of roytam's browsers are with the current Mozilla Sync system, if they are at all.

Certainly any update now carries the risk of breaking compatibility with XP! Did you check to see if YouTube is using HTML5 or Flash in FF 52? If you'd rather now just carry on with FF 51, is everything working OK now?

That sounds like you're not looking where I'm looking. Are you looking at the Windows Update history list? On my Windows 10, if any update fails, there's an entry which says "XX update failed to install on xx date, error code xxxx". Does yours not say that?

Unless you've disabled the function, the add-on will probably automatically update itself to the latest version. It would be interesting to see if it then carries on working.

Yes indeed, sorry for any confusion, I was replying to @Paul75. I'm afraid I have no idea why the latest update won't install on your Windows 10 system. If you look at the Windows Update "View Update History" section, your failed installs should be listed there. Is there an error code quoted?

I suspect that @Sfor's main problem is that his Primetime Content Decryption Module isn't working as it should be on Firefox 52 ESR. The sites which have a problem are I suspect ones which use HTML5 video and no longer have a working Flash fallback system, so they are just throwing up errors when HTML5 fails.

The problem is with the MSO.DLL file. The updates which replace this file are now replacing it with a version that is not compatible with Windows XP. The last compatible version is 14.0.7214.5000, which is date stamped 14th September 2018, and was included in KB4092483. All later versions will not work, and there is no solution to this I'm afraid. Microsoft have been told about this, but not surprisingly have not done anything about it. I'm sure their line now is that none of their software is now supported on Windows XP, even if it was originally.

Welcome to the forum! I got the update fine on the Windows 10 side of my machine, but I have the 64 bit version of Office 2010 installed there, with the 32 bit version on XP. Maybe it doesn't like installing a 32 bit update on a 64 bit OS, but if that's the case I'm surprised this hasn't happened before. Even if no error message appears when you try to install the update, is there anything in the Windows Event Logs?

Is YouTube using Flash or HTML5? You can easily tell by right clicking on a video window and seeing what pops up.

Don't reset your existing profile, just make a temporary new clean one. You can easily revert back to your previous one when you've finished testing. The necessary dialogue is under "about:profiles". The site you mention seems to work absolutely fine here in FF 52.9. In fact the videos don't seem to be using Flash at all, they are using HTML5 video, which is what I would now expect. There's no evidence here that it's loading the Flash plugin at all.

Certainly recent versions of Firefox only support the NPAPI Flash plugin, and no others (the latest version 69 will no longer allow you to set it to always activate) but Firefox 52.9 ESR certainly has full NPAPI plugin support, I have over 60 of them registered! I would suggest that you try this with a temporary new clean Firefox profile, as corruption somewhere in the profile is the most likely cause of this issue. Do you have an example of a site showing the problem just so I can make sure that it isn't happening on my system as well?!

Sorry if I'm asking the obvious, but you have got the latest version of the plugin I assume (32.0.0.255), and it is set to "Always Activate" in the settings?

What Flash problems were you having with 52 ESR? It all seems to be working fine for me.

Well it's perfectly possible that I didn't run the file checker after the previous Office update, so those Excel files could have been updated by that, not by the latest one! They do have the same file version as the new ACECORE.DLL though, if that's relevant.

Strange, Custom User Agent String should work with any Firefox version above 48. Have you tried one of the older versions?

As far as I can see from my system file checker, the files updated were ACECORE.DLL (Microsoft Access database engine DLL), EXCEL.EXE, and EXCELCNV.EXE. All are now version 14.0.7237.5000. Why an update apparently for Outlook should update Excel files I have no idea!

I couldn't agree more, a very generous gesture, which will I hope ensure that Rudolph will never be forgotten by the DOS and Windows 98 preservation community. I have four of his programs, and I will happily provide them if they prove to be missing from the proposed archive.

It would certainly be a great shame if Rudolph's work now became permanently unobtainable. We don't know the circumstances of his death of course, but if he knew enough in advance what was going to happen, he may well have taken steps to preserve his program archive and make it available in the future as part of his legacy. We can only hope that he did have a chance to do that.

Wasn't sure which section to put this in, but here's as good as anywhere. I can't vouch for the accuracy of the information, but it's quite hypnotic to watch! https://www.youtube.com/watch?v=eJuvKn5j_kE

So shocked to hear this, it was only a month or so ago that I was corresponding with Rudolph about a disk partition alignment program that he had just built. I use several of his programs, to enhance my Windows 98 installation, and to do things like applying TRIM to my FAT32 SSD. He was an absolute genius, up with the very top experts on this forum IMO. 67 is no age to go nowadays. RIP Rudolph.

Of course there is now an iPhone 11, but the argument is certainly valid with desktop OSX and Windows 10, which I suspect will be with us for the foreseeable future!