Firefox CPU Power Consumption values have incorrect units (µWh instead of Wh)

[canova]

I was looking into #4329 and realized that the power consumption values have incorrect units. It should be Wh and not µWh.

The same STR with #4329 can be used for testing.

For example it shows 0.0036 µWh in a report on my machine, but it should be 0.0036 Wh (or better yet, 3.6 mWh).

Inside the Firefox Profiler we also have a logic to choose the best unit depending on the value:
https://github.com/firefox-devtools/profiler/blob/6306555856f9c5b1f539462f24c182b7c07d477b/src/components/tooltip/TrackPower.js#L84-L115

So this way the unit is always readable/meaningful to the user. But I don't know how easy it is to implement something similar here.

[soulgalore]

Hi @canova ooops, thanks! Let me fix that.