Font fingerprinting breaks the font-face property

[savchenko]

Expected Behavior

Enabling "spoof font fingerprint" does not break basic font definitions (sans, serif, monospace, etc)

Current Behavior

From webbrowsertools.com/font-fingerprint:

Basic font list Support Metrics Metrics
>>                              
default         ✕       N/A     N/A
cursive         ✕       N/A     N/A
fantasy         ✕       N/A     N/A
monospace       ✕       N/A     N/A
sans-serif      ✕       N/A     N/A
serif           ✕       N/A     N/A

Example screenshot:

Relevant settings

chameleon_1597487289000.json.log

This can be reproduced with browser.display.use_document_fonts set to either 1 or 0.

Context (Environment)

FF 79.0
Chameleon v0.20.24

Might be related to #360

[sereneblue]

@asvc I'm able to replicate your example screenshot of Github by changing the about:config preference you mentioned above, but not with Chameleon.

I did encounter the same issue with https://webbrowsertools.com/font-fingerprint. It does seem Chameleon is missing some font faces but I'm a bit confused about the lack of serif support. That should be supported. I'm looking into this.

[savchenko]

With Chameleon v0.21.0, browser.display.use_document_fonts is set to 1 (default).

"Spoof font fingerprint" enabled:

[Z0pyrus]

I have the same issue, but not on all sites. On those where I encountered this, i added them to a whitelist were Enable spoof client rects is turned off

[sereneblue]

@savchenko This is now resolved in v0.22.22.