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/