Blocky fonts could just be Yahoo falling back to older fonts as it finds the Windows/MacOS fonts not installed on the local system. The easiest thing you could do to verify this is install the mscorefonts (the way to install it changes every few years, so you'll need to search it).
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You probably don't need the ms core fonts exactly, as long as there are compatible replacements installed. But that's a simple enough starting point, agreed.
Correct, the mscorefonts may be a little overkill, but it would be the quickest solution. My guess is that Debian's default fonts "aren't up to par", so they could also download and install other fonts and use them as the default san-serif font, but unless they got lucky it could take longer than just installing the fonts their father knows and loves.
You can use this font.conf
to improve your font rendering: https://gist.github.com/AhmedMostafa16/e2ee6661899f405781dbce54ae231158
Save it to ~/.config/fontconfig/fonts.conf
. Then install all the font packages mentioned in the comments. Finally, run fc-cache
and/or reboot your system to apply the changes.
Note that this isn't a magical fix, you may still need to tweak the hinting/aliasing/subpixel rendering etc based on your monitor, resolution, DPI, and personal preference. Check out this page for more details on how to tweak this + some troubleshooting tips: https://wiki.archlinux.org/title/font_configuration
Wow, that's a lot of tweaks!