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Some Videos are Played, Some Don't and No Problem in Troubleshoot Mode

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Recently, a few days ago, I've switched to Windows 10 and had no problem before switching. Now, some videos are being played like: https://old.reddit.com/r/CatsBeingCats/comments/t7dio2/cats_can_play_fetch_too/ And other don't like: https://old.reddit.com/r/CatsBeingCats/comments/t76xw0/what_he_comes_out_of_a_crack/

I have installed the Media Feature Pack already and cleaned the cookie cache and all of the history and updated the blockers and disabled all the plugins (including the theme) and completely reinstall the whole browser while not logging into my account and it still doesn't work. But it has no problem in Troubleshoot mode or if I open it in Internet Explorer.

The video bar, settings, fullscreen mode, all comes up, but the video is stuck in a loop of loading forever. Never stopping and playing the video, just loading and the circle just rotating.

Recently, a few days ago, I've switched to Windows 10 and had no problem before switching. Now, some videos are being played like: https://old.reddit.com/r/CatsBeingCats/comments/t7dio2/cats_can_play_fetch_too/ And other don't like: https://old.reddit.com/r/CatsBeingCats/comments/t76xw0/what_he_comes_out_of_a_crack/ I have installed the Media Feature Pack already and cleaned the cookie cache and all of the history and updated the blockers and disabled all the plugins (including the theme) and completely reinstall the whole browser while not logging into my account and it still doesn't work. But it has no problem in Troubleshoot mode or if I open it in Internet Explorer. The video bar, settings, fullscreen mode, all comes up, but the video is stuck in a loop of loading forever. Never stopping and playing the video, just loading and the circle just rotating.

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If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, DuckDuckGo PE, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for relevant-looking messages about blocked content.


You can try these steps in case of issues with webpages:

You can reload webpage(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 (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css 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 Troubleshoot Mode start window