0. Win 10 64bit, latest Firefox, Avast, Flash
1. Click on 1 of 6 .mp4 video links on my home page eg
http://rnsdb.x10.mx/rnsdb/vcoins-invcoll.mp4 Firefox gives me the above error.
2. Clicking on 1 of 5 .mp4 video links in another folder eg
http://rnsdb.x10.mx/recs/v1dcp.mp4 works ok
3. Everything works ok in Chrome and Edge browsers. If files are downloaded or opened, they play okay, as do the video files that were uploaded to my web site
4. Turning off Avast virus checker fixes the problem, so I don't know if it's Firefox or Avast.
5. Entering a URL exception in Avast for
http://rnsdb.x10.mx/* doesn't help
6. Clearing history doesn't fix. Adobe flash Shockwave 18.0.0.232 is latest version.
7. Firefox about:config and changing media.windows-media-foundation.enabled to false doesn't help nor does unchecking "Enable Adobe Flash protected mode"
8. Sometimes, hitting Firefox reload 6 or 7 times in a row plays the video, but it reverts back to failing next time
9 It's doing the same thing on 3 Win 10 desktops and 3 Win 8/10 laptops all with latest version software
The strange thing is why one set of .mp4s should play and another set in another folder not play. I uploaded them several times and it still fails, so the files are not corrupt. Is this a Firefox problem or an Avast problem?
Thanks, Ron