Window classes change after update restart

When Tor Browser restarts after an update its window classes change from "Navigator" and "Tor Browser" to "Navigator" and "Firefox". I've found these differences with the xprop tool.

I use the i3 window manager and have it configured to make Tor Browser floating based on its window class. After the Tor Browser update restart its window was no longer floating.

The issue does not occur when Tor Browser restarts for a new identity.

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