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White box at the top of youtube full screen

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Earlier today I tried to full screen youtube and It wouldn't work. I saw some suggestions on here saying delete cookies so I did and now it full screens, however the video is partway down the screen and above it is an empty white box. I've tried restarting in safe mode and deleting cookies again and neither of those worked. i'm having no issues in other browsers so I have no idea what could be causing it.

Earlier today I tried to full screen youtube and It wouldn't work. I saw some suggestions on here saying delete cookies so I did and now it full screens, however the video is partway down the screen and above it is an empty white box. I've tried restarting in safe mode and deleting cookies again and neither of those worked. i'm having no issues in other browsers so I have no idea what could be causing it.
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Additional System Details

Installed Plug-ins

  • Shockwave Flash 24.0 r0

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

More Information

cor-el
  • Top 10 Contributor
  • Moderator
17416 solutions 157344 answers

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You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Remove the Cookies" from 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 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
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try these steps in case of issues with web pages: You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences). "Remove the Cookies" from websites that cause problems: *Options/Preferences -> Privacy & Security<br>Cookies and Site Data -> Manage Data "Clear the Cache": *Options/Preferences -> Privacy & Security<br>Cookies and Site Data -> Clear Data -> Cached Web Content: Clear Start Firefox in <u>Safe Mode</u> to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if <u>hardware acceleration</u> is 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 *https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode *https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems
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