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Firefox-related CPU use is only reduced by 75% when this bug is caused. NOT in the general case as this title implies

That's actually fairly clear in the title - the second clause depends upon the first.

Then why are comments assuming a large decrease in power consumption?

Because the bug is a frequent occurrence and the increased CPU usage is frequently noticeable?

Except it's not lol

Because a lot of commenters don't read the articles

Exactly