I've used this theme for years now but it requires an update by its developer because when Firefox is switched to dark theme, the theme doesn't switch to dark and thus, for example, the bookmarks side menu is displayed against a white background with white text.

I'm using the vinyl theme by baliclem and would like to report an issue. my monitor settings are 4K x 2K 3840 x 2160. The vinyl theme doesn't apply the theme color to the top left corner of my firefox browser. The back arrow button still functions but is almost invisible. I'm assuming the theme isn't designed to stretch across the entire browser frame. I've corrected the issue by reducing my monitor dimensions. Is there another way to stretch the theme so the toolbar color is consistent across the top of my browser window?

Seburo posted an answer to your question "vinyl theme by baliclem"
Hi

This is something that you should report directly to the independent artist of that theme directly through the add-ons site you downloaded it from.

From what you are saying, the image file has not been made large enough for wider screens.

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great response. I downloaded the theme via Firefox since it was offered on the Firefox theme page. How do I contact a firefox theme developer?
The theme in question is "vinyl" by Baliclem.
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I apologize if this isn't the correct forum for reporting issues. I was directed here after asking for developer contact info:

Hi

You can leave a review for them with feedback at:

https://addons.mozilla.org/en-US/firefox/addon/my-vinyl/

Big fan. Had this for years. Suits dark theme, subtle. Needs more users.

Having been a radio announcer for many years and, a vinyl aficianado since youth, this was a no-brainer to pick. I've had it on for a couple of years.

As others have stated, this is very well done, the turntable is there, muted and unobtrusive. A nice change for design themes, which tend to be loud and distracting. Also, being an old school music lover, this is a win-win!