Firefox - Ugly fonts with some PDF's

Hi everyone,

For example, fonts in Firefox in PDFs in looks very ungly. In Chromium they are fine.

Left is Firefox, right is Chromium:

Fonts are fine in Okular. Also, in Firefox, it does not happen with all PDF’s.


With certain types of PDF files, the PDF Viewer may have problems displaying fonts, colors, or the whole document. If some PDF files don’t render well or are blank, click the download button on the right side of the document header to open it with the default PDF viewer application on your computer.
View PDF files in Firefox or choose another viewer | Firefox Help


However, for same reason, in my other PC (also running manjaro) the same PDF works fine in Firefox…
I don’t remember if I even did something about it or not.

Thanks for your response.