Thanks for sharing that information. Fonts were not being rendered without adding an exemption. Instructions for future reference if resist fingerprinting is on: in about:config modify privacy.resistFingerprinting.exemptedDomains and add messenger.abeto.co/. Example: .example.invalid,*messenger.abeto.co/ Obligatory disclaimer that fingerprinting is then possible for that site and one's privacy could be compromised. Use at your own risk and all that.