As a native speaker of English, if I'm talking to someone else who speaks English, then I expect a one-minute message will take one minute to transmit with 100% comprehension.
Relying on my Japanese, it will take two or three minutes and comprehension will drop to about 80%. Largely depends on how well we both understand the context around the topic.
If it's a three-way session with a human translator who doesn't know the topic of the conversation, then best case is 10 minutes and lucky to get 60%.
But when you try an AI translator you should plan for half an hour and you are lucky if you get 40% of the message across.
As it applies to Mozilla, I've abandoned hope, but I'll throw out a question for the so-called wisdom of Slashdot's crowds. Lately I'm seeing freezes in Firefox. Workaround is to exit Firefox completely. CPU usage will remain very high for several minutes, but it will eventually terminate, though I usually lose my patience and just nuke it from the Task Manager. I've been unable to can the other side of the bug, the cause, but I suspect it's related to YouTube ads. Only one machine shows the problem, but I have not seen it on other Windows machines, on (Ubuntu) Linux machines, on Android smartphones, or on my lowly Chromebook, but I don't listen to many videos on any of those machines... Meanwhile, Mozilla has started nagging me to try new features that I did NOT offer to pay for. Nor was I asked what I wanted. Actually several of the new features sound like things I would pay for to make them go away.