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Scrollbar on Youtube lost the UP and DOWN buttons

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On all other websites I can seen the scrollbar buttons but not on Youtube. I'm running Windows 10.

On Linux Mint MATE 20.1 (and Ubuntu 20.10) the scrollbar also looks different from the default theme.

This seems to be a problem being caused by "youtube.com".

Why is Firefox allowing websites access to the scrollbars? Does anyone know why this happens or if there is a solution?

Thank you.

Chosen solution

This can possibly be caused by the website setting custom scroll bars.

You can use code in userContent.css (so not in userChrome.css) to disable custom scroll bars.

Add code to the userContent.css file.


/* Disable custom SCROLLBARS */
* {
 scrollbar-color:auto!important;
 scrollbar-width:auto!important;
 }

It is not that difficult to create if you have never used it.

The first step is to open the "Help -> Troubleshooting Information" page and find the button to access the profile folder.

You can find this button under the "Application Basics" section as "Profile Folder -> Open Folder". If you click this button then you open the profile folder in the Windows File Explorer. You need to create a folder with the name chrome in this folder (name is all lowercase). In the chrome folder you need to create a plain text file with the name (name is case sensitive). In this text file you paste the text posted. On Mac you can use the TextEdit utility to create the file as a plain text file.

In Windows saving the file is usually the only time things get more complicated because Windows can silently add a .txt file extension and you end up with a file named .txt. To avoid this you need to make sure to select "All files" in the dialog to save the file in the text editor using "Save File as".

You need to close (Quit/Exit) and restart Firefox when you create or modify the file.

See also:

In Firefox 69 and later you need to set this pref to true on the about:config page to enable userChrome.css and userContent.css in the chrome folder.

  • toolkit.legacyUserProfileCustomizations.stylesheets = true

See:

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All Replies (2)

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Chosen Solution

This can possibly be caused by the website setting custom scroll bars.

You can use code in userContent.css (so not in userChrome.css) to disable custom scroll bars.

Add code to the userContent.css file.


/* Disable custom SCROLLBARS */
* {
 scrollbar-color:auto!important;
 scrollbar-width:auto!important;
 }

It is not that difficult to create if you have never used it.

The first step is to open the "Help -> Troubleshooting Information" page and find the button to access the profile folder.

You can find this button under the "Application Basics" section as "Profile Folder -> Open Folder". If you click this button then you open the profile folder in the Windows File Explorer. You need to create a folder with the name chrome in this folder (name is all lowercase). In the chrome folder you need to create a plain text file with the name (name is case sensitive). In this text file you paste the text posted. On Mac you can use the TextEdit utility to create the file as a plain text file.

In Windows saving the file is usually the only time things get more complicated because Windows can silently add a .txt file extension and you end up with a file named .txt. To avoid this you need to make sure to select "All files" in the dialog to save the file in the text editor using "Save File as".

You need to close (Quit/Exit) and restart Firefox when you create or modify the file.

See also:

In Firefox 69 and later you need to set this pref to true on the about:config page to enable userChrome.css and userContent.css in the chrome folder.

  • toolkit.legacyUserProfileCustomizations.stylesheets = true

See:

Helpful?

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Thank you so much! That solved the problem.

I just had to restart Firefox at the end. The scrollbar is now back to normal on Youtube.

Helpful?

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