The problem are the embedded bitmap glyphs, which get selected for small font sizes.
Please try if the attached fontconfig snippet fixes the problem:
$ sudo cp 20-tahoma.conf /etc/fonts/conf.avail/ $ sudo ln -s /etc/fonts/conf.avail/20-tahoma.conf /etc/fonts/conf.d/
Then test if the output in firefox and the rendering in wine is acceptable.
The problem are the embedded bitmap glyphs, which get selected for small font sizes.
Please try if the attached fontconfig snippet fixes the problem:
$ sudo cp 20-tahoma.conf /etc/fonts/ conf.avail/ conf.avail/ 20-tahoma. conf /etc/fonts/conf.d/
$ sudo ln -s /etc/fonts/
Then test if the output in firefox and the rendering in wine is acceptable.