Tor Browser: poorly readable fonts

[mehlon]

Describe the bug The fonts in the Tor Browser are harder to read and don't look as good as in Firefox.

To Reproduce Steps to reproduce the behavior:

1. Open duckduckgo.com on both Firefox and Tor Browser.
2. Compare which one looks better.

Expected behavior Tor Browser should have good readable fonts by default, like on Firefox.

Screenshots Firefox on NixOS: Tor Browser on NixOS:

Additional context The default font on Firefox appears to be DejaVu Serif 16, whereas Tor Browser has Arimo 16. The fonts for Tor Browser look good on Windows and on Tails. I didn't check which fonts they use by default.

Metadata Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

• system: "x86_64-linux"
• host os: Linux 5.4.23, NixOS, 20.03beta448.1f99fd2fdbe (Markhor)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.2
• channels(root): "nixos-20.03beta570.730453919bd, u-20.09pre216928.991bbef6835"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:

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[felschr]

Tor Browser comes with its own set of fonts to prevent fingerprinting. But since you mentioned it also looks different than Tor Browser on Tails, I'll look into it.

If you still have a Tails installation at hand you could compare the fonts fingerprints using this website: https://browserleaks.com/fonts