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This will be fixed in our 18.4 release today, should be published shortly…
Hi,
Sorry to hear that…
We have a new release 18.4.2 ready (due to out today). There are performance improvements and bug fixes in this release. This should solve the issue you’re facing.
May I ask, what’s the exact Firefox “slow page” warning you’re getting? Can you copy-paste it here, please?
Thanks.