See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Many site issues can be caused by corrupt cookies or cache.

• Clear the Cache and

• Remove Cookies
  Warning ! ! This will log you out of sites you're logged in to.

Type about:preferences<Enter> in the address bar.

• Cookies; Select Privacy. Under History, select Firefox will Use Custom Settings. Press the button on the right side called Show Cookies. Use the search bar to look for the site. Note; There may be more than one entry. Remove All of them.
• Cache; Select Advanced > Network. Across from Cached Web Content, Press Clear Now.

If there is still a problem, Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). While you are in safe mode;

Type about:preferences#advanced<Enter> in the address bar.

Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.

Poke around safe websites. Are there any problems?

Then restart.

Thanks for your quick response FredMcD I checked my graphics driver, says it is the latest. I took every step that you suggested, and still not working on Tunein.

I tested on my old Firefox computer to see if it works and it does.

I went on some other radio sites to see if it works and most of them it does. This one it does not: http://www.internetradiouk.com/ This one works on my old computer.

I took a look at my add-ons plugins. Big difference what is installed on my new computer and my old.

I doubt that I am missing a plugin on my new computer, because TuneIn was working a few days ago, and I did not remove any plugins in the meantime.

Puzzling.

Are you using and blocking programs/add-ons?

Start your Computer in safe mode with networking. Then start Firefox. Try Safe websites. Is the problem still there?

Starting The Computer In Safe Mode;
Free Online Encyclopedia

Thanks again Fred, the problem is solved.

Before doing your last suggestion, what I did was Refresh Firefox.

I then did a test to see if TuneIn Radio worked and it did not.

I then went ahead and re-installed the extensions that I use.

I then closed Firefox, re-opened Firefox, went to Tunein Radio and it worked.

Firefox mystery.

That was very good work. Well Done. Please flag your last post as Solved Problem so others will know.