No compatible source was found for this media.

[MozillaMonkey]

This one's been bothering me now for at least a couple of years now.

I have a couple of profiles that I use with Firefox:
my preferred slimmed down version (A) and my heavier version (B).

Many videos won't play with (A) but will with (B).

Is there a way I can figure out what is allowing (B) to play the videos
or what is preventing (A) from playing them?

I usually get the error message in the title to this thread.

[James]

It does not help that you are using a rather old EOL Windows XP (April 8, 2014) in which Microsoft has not supported with media feature packs like they do with Vista and later for to have the required codecs needed. You have limited support of HTML5 players that most sites are using now days as Adobe is discontinuing all support of their Flash Player at end of 2020.

Besides using a newer Windows you could use a 32-bit Linux distro with a light desktop like Xfce and make sure you have packages like FFmpeg installed to have the codecs needed.

[MozillaMonkey]

It does not help that you are using a rather old EOL Windows XP (April 8, 2014) in which Microsoft has not supported with media feature packs like they do with Vista and later for to have the required codecs needed. You have limited support of HTML5 players that most sites are using now days as Adobe is discontinuing all support of their Flash Player at end of 2020.

Besides using a newer Windows you could use a 32-bit Linux distro with a light desktop like Xfce and make sure you have packages like FFmpeg installed to have the codecs needed.

Thanks James.
I know my WinXP desktop is on its last legs, so to speak.

I guess I continue to use it because so many programs still work despite its age.
And hackers feel the user base is so small, they don't bother with viruses anymore.

I am beginning a transition to modern-day technology.
For example I have several notebooks that run Win 8.1 and I just
bought a second motherboard and built a new system that is running Win 10.
But it's in another room and I haven't made it my mainstay yet.
Old habits are hard to break.

I even have a USB stick I made that can boot into Linux (tried it and it works!).

So there's still hope for me.

But getting back to my initial question.
Is there an easy way to figure out what is allowing one of my profiles to view videos but
not my other profile?

...
I am very happy to report that I have found a way to get my main profile working as another of my profiles!
I can now watch/download videos that I previously couldn't with this profile.
There is life still left in WinXP.

I read a post here from another user that led me to discover the profile that worked had Adobe drivers installed/working
but the profile that didn't work did not have the drivers installed.
Lord only knows why FF would make this distinction and also not let users know from the get go, when creating a new profile!

[James]

Due to WinXP not having the codecs you may only get three or four out of six things it can support with HTML5.

This may help you get more support of html5 on WinXP.
https://msfn.org/board/topic/175591-ena ... out-flash/


https://www.jeffersonscher.com/sumo/html5-video.html