I much appreciate that You take the time to post new findings from K-Meleon RU in this international forums - thank You (spassibo - spelling = German letters sound-transcription).
IMHO it is also a cool find - I am going to try it.
My initial assumptions were: You already verified that it relies on a feature already present in all Gecko engines & not only in those using a toolkit back-end (firefox and 1.9 branch).
And that it is only not activated by default. greetings from ahnnover
p.s. there is no harm but only much potential
profit in trying it.