Restart your system and check the Internet connection

First of all check, you have a proper Internet connection that means you can easily play HD video within browser easily I would like to suggest please use online speed test tools. Speed is a good enough and follows the next steps.

Update your Mozilla Firefox browser

Open Mozilla Browser on your computer, find three horizontal line and select about Firefox.

About Mozilla, Firefox popup see the option for

the check for updates it will download in automatically
wait for download complete and go with the restart to update Firefox button.

Now you have the latest version of Mozilla Firefox install on your system set the error is fixed or Persist.

Disable hardware acceleration in Firefox

To disable hardware acceleration go to the tools > options > advanced > general > browsing use hardware

acceleration unavailable.

To identify hardware acceleration reall y causing the problem Launch Mozilla Firefox in safe mode,

How to open Mozilla Firefox in safe mode

open Mozilla Firefox > go to the Firefox menu button [Horizontal Three Line] > click on help > select restart with add-ons disabled > Firefox will open with safe mode dialogue window.

Dinushi Dhananjani said

Restart your system and check the Internet connection First of all check, you have a proper Internet connection that means you can easily play HD video within browser easily I would like to suggest please use online speed test tools. Speed is a good enough and follows the next steps. Update your Mozilla Firefox browser Open Mozilla Browser on your computer, find three horizontal line and select about Firefox. About Mozilla, Firefox popup see the option for the check for updates it will download in automatically wait for download complete and go with the restart to update Firefox button. Now you have the latest version of Mozilla Firefox install on your system set the error is fixed or Persist. Disable hardware acceleration in Firefox To disable hardware acceleration go to the tools > options > advanced > general > browsing use hardware acceleration unavailable. To identify hardware acceleration reall y causing the problem Launch Mozilla Firefox in safe mode, How to open Mozilla Firefox in safe mode open Mozilla Firefox > go to the Firefox menu button [Horizontal Three Line] > click on help > select restart with add-ons disabled > Firefox will open with safe mode dialogue window.

if those steps are not work you can try this

second Method for open Mozilla in Safe mode

Shortcut method for open Mozilla in safe mode is press shift button and click on the browser icon to directly launch in safe mode

Thank you all for the responses. I Already tried safe mode, and FF is up to date- settings are all the same on all computers. I finally found the fix- I have Shark007 codecs installed on all PCs, for some reason, it must've got corrupted on this one, all I had to do was "Reset All", and that fixed it.

Again, thank you all.

You can find out what the error 102630 means in the article below. https://developer.jwplayer.com/jw-player/docs/developer-guide/api/errors-reference/

Depending upon the version of JW Player you are using, they may no longer support RTMP. Your URL would look as follows.

   http:///172.16.218.23:1935/vod/mp4:sample.mp4/playlist.m3u8

Below is JW Players configuration reference page. They have depreciated RTMP support for version 8. https://developer.jwplayer.com/jw-player/docs/developer-guide/customization/configuration-reference/#rtmp

Also note that Adobe is ending support for their Flash Player at the end of 2020 as mentioned in their article below. https://theblog.adobe.com/adobe-flash-update/