>>1535376custom fonts can be used to fingerprint (and hence deanonymize) you, so the tor browser probably disables them
there is an icon to the left of the address bar to give the webpage permissions, such as canvas read data, but I don't know if this also includes the option to allow fonts
if you don't care about fingerprinting but still want to use tor for some reason, you can try standalone tor with a normal browser, or open a tor tab in brave (which doesn't have the privacy features of the tor browser)
