Can you explain what happens?

once the particular program is selected the buffering swirling icon comes on and continues untill ther is nothing but black or I get Gah your tab has crashed

Anything relevant-looking messages in the Browser Console ? *https://firefox-source-docs.mozilla.org/devtools-user/browser_console/ Start Firefox in <b>Troubleshoot Mode</b> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <b>hardware acceleration</b> or if <b>userChrome.css/userContent.css</b> is causing the problem. *switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes *do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window *https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems