Firefox webextention addon.
A toolbar button to toggle web custom font.
Disabling it resists font fingerprint.
Users who want to resist font fingerprint can disable web custom font by setting browser.display.use_document_fonts = 0 in about:config, but that will break some web. So I made this button to toggle it.
Support setting keyboard shortcut.
Also another toolbar button, to toggle Firefox's "resist fingerprinting": Aaron-P/ToggleResistFingerprinting. User may want to use both.