toolbars_below_content_v2.css breaks image themes (e.g. Firefox Alpenglow)

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• Downloaded raw file from 94f5ef9
• Firefox 133.0.3 (aarch64) for Fedora 40 (Asahi Linux)

Normally, I use a Spirited Away theme, which uses a fixed-size image to create its colour scheme. With the toolbars offset, the images are no longer shown, and only a grey background remains.

This issue can also be observed on the included (I think?) Firefox Alpenglow theme, which was supposed to have a bunch of glowy effects (which are presumably images), which are missing when toolbars_below_content_v2.css is applied.

Both themes work with toolbars_below_content.css, both before and after Firefox 133 - though the old version has different (expected ) issues on versions 133 and above.