Stable version (5.3.1184.25)

[S8F8ry]

none of my font-changing userscripts work.

Is the "Allow User Scripts" option under the extension details properly checked?

If the option is already checked but the problem persists, you can try the following "brute force" method: first, back up the scripts and stored data within the extension; then, uninstall the userscript extension; finally, reinstall it and import the scripts and data back in.