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Mute button on tab

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Clicked mute button on KDFC tab and page lost sound permanently. Mute button disappeared. Streaming button no longer clickable. This effect on 2 different computers! IT friend looked at it and was puzzled. He created...private window?...and sound is fine. What is the problem and is it KDFC, my computer, or Firefox????

Clicked mute button on KDFC tab and page lost sound permanently. Mute button disappeared. Streaming button no longer clickable. This effect on 2 different computers! IT friend looked at it and was puzzled. He created...private window?...and sound is fine. What is the problem and is it KDFC, my computer, or Firefox????

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You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • hold down the Shift key and left-click the Reload button
  • press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" for websites that cause problems:

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Safe Mode start window