EXTENSION FONT LAB
Loading packager
A tiny browser utility

Route Claude through your system font.

Paste the CSS you want to override. The lab transforms font-family declarations and packages a real MV3 extension you can inspect before loading.

CSS source

Any font-family declaration is replaced with the macOS system stack.

Ready for CSS.
Boundary: this creates a package; it does not install or remotely change Chrome. Future Claude DOM changes may require selector edits.
Generated artifact

No package generated.

0 REPLACED
Transform the sample to inspect the extension files.
MV3 · Claude URL match · local packageJSZip 3.10.1 · no credentials
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