Firefox drop-down bar is transparent

When you hover near the top of the window in a Firefox web app the drop-down bar is now transparent.

The screenshot is from Firefox 150 but I believe this issues started with version 149 (though not positive about that).

Here's how to fix that meanwhile:

Go to about:support in the web app
Click the button on the right side of "Profile Directory" text.
Go to "chrome" folder
Open userChrome.css
Replace the file's content with this: https://raw.githubusercontent.com/MrOtherGuy/firefox-csshacks/refs/heads/master/chrome/autohide_toolbox.css
Change the --uc-autohide-toolbox-delay: 200ms; to --uc-autohide-toolbox-delay: 0ms; to keep the original behavior set by LM devs.

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