Youtube - Progress Bar Missing

Hello.

When I open Firefox -> Youtube.com and log in, I can't see a progress bar (red) on video thumbnails. Instead I can see 'WATCHED' tag that is greyed out. How to get the progress bar back?

Btw when I open Google Chrome there is no issue and I see the progress bar under my account.

Thanks for any help.
LVL 13
Hello ThereSystem AdministratorAsked:
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Hello ThereSystem AdministratorAuthor Commented:
Found this:
go to Options, Cookies, search for “youtube” and delete all the cookies

Well, I've spent an hour trying to solve this.
This has nothing to do with old version of Flash Player or bad configuration (Firefox -> type 'about:config' to the URL bar -> search for 'media.mediasource.webm.enabled = false' -> change to true). It's a known bug.

Solution 1: Go to YouTube.com -> click on the green lock in the URL area -> click on the arrow -> More -> Security Tab -> Show Cookies -> Delete All Cookies

Solution 2: Firefox -> Options -> Privacy and Security -> under History section go to 'Show Cookies' or 'delete individual cookies' (depends on your settings) -> delete all YouTube cookies
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Hello ThereSystem AdministratorAuthor Commented:
But for sure, check 'https://www.youtube.com/html5' if all players are enabled. If not, type 'about:config' to the URL bar -> search for 'media.mediasource.webm.enabled = false' -> change to true.

Note: It might happen when you clear the Firefox history and delete cookies and cache.
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