I used to watch n download YouTube videos on Firefox till ystday. Now, the videos wont play and the download stopped working, while the videos do play on Chrome

I used to watch and download YouTube videos on Firefox. Since yesterday, videos have stopped loading, and an error message is shown saying videos can't be played. When I click on the download button, a new page pops up (which never used to happen before) which says "Server not found: Firefox can't find the server at r12---sn-h557sne7.googlevideo.com."
I have tried almost all suggestions found in various forums. The problem is not yet rectified. Its irritating.

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You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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