test: Fix Firefox CDP driver for version 97 nightlies
test: Fix Firefox CDP driver for version 97 nightlies

Firefox 97 enables Fission [1] by default to improve site isolation.
This broke DevTools Protocol's `Page` events [2]. Disable Fission to
work with current nightlies as well.

This bug hopefully gets fixed at some point, but this workaround will
not break.

[1] https://wiki.mozilla.org/Project_Fission
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1746154

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