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Hello and welcome to MSFN forums! IMHO, you have a bigger problem in your hands by staying with Fx 28.0 ; it was released back in Mar 2014, still has a lot of unresolved functional bugs, not to mention that, security-wise, it has more holes than a piece of Swiss cheese... If you're clinging on it because it was the last pre-Australis major Fx release, then you can switch to latest, but EOL'd, FxESR 52.9.0 and install Classic Theme Restorer to regain 95% of the pre-Australis GUI+features; or install latest New Moon 28 build (a Pale Moon 28 fork modified so as to run on XP/Vista) that never implemented the Australis design... As for your original query: am afraid the answer is NO Fx 28.0 is simply too old; it does not support any form of EMEs (Encrypted Media Extentions = DRM components) and relevant CDMs (Content Decryption Modules), so installing Adobe Primetime CDM on Fx 28.0 is out of the question... On top of that, Fx 28.0 has no support for Media Source Extensions (MSE), needed for youtube MPEG-DASH streams; visiting https://www.youtube.com/html5 with Fx 28.0 on XP you should have got only HTMLVideoElement and WebM VP8 ticked in blue (i.e. supported); it would appear that youtube have retired the VP8 encodes, thus rendering Fx 28.0 on XP unusable... ; BTW, I'm not just speculating, I have got a portable installation of Fx 28.0 on an external HDD and by toggling media.windows-media-foundation.enabled (from true to false) I simulated an XP environment and conducted tests before posting this... On those of us on Vista and higher, Fx 28.0 by default has H.264 ticked in blue, because Fx 28.0 has support for Media Foundation, hence it has access to patented system decoders (h.264/aac) not present in the XP OS (by a M$ decision)... So I can still use Fx 28.0 on Vista on youtube, they serve me a progressive download (no MSE) of an MP4 encode... You want youtube in XP? 1. Use Google Chrome 49, or Advanced Chrome fork (or possibly other Chromium derivatives still supporting XP, e.g. Maxthon...) 2. Update to FxESR 52.9.0 ; native support for MSE+WebM VP9 (for other sites that require h.264/aac native browser support, follow the guides of this thread). 3. Update to New Moon 28 or Basilisk 52.9.0 by roytam1; both have native support for H.264/MSE+H.264/MSE+WebM VP9; (some) people on XP have encountered a small nuisance on Youtube, affectionately known as the "23min youtube bug"; it's not a deal breaker, TBH... And at least one person here has reported better aac (audio) decoding experience by disabling native support in Basilisk 52.9.0 and installing Adobe Primetime CDM there, as per this thread... Hope I made everything clear for you, I'm confident others can chime in for more detailed help, if you need it that is ...

I wrote a toolkit that automates part of the process for customizing Windows 9x Installation CABS. It does not automate Layout*.inf or Copy*.inf File modifications.