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Bug 1107251 Comment 38 Edit History
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Sorry for my late reply, I did not notice your request for info until now. Yes, I am able to reproduce needlessly high CPU load on hanging connections also with a current Firefox (version 112), by setting up proxy 1.2.3.4 as stated in my OP above, which meanwhile is 8.5 years back. With Firefox meanwhile "only" 15% of a CPU core gets wasted on my current Linux machine, apparently due to some silly busy waiting. With current Thunderbird the wast is even about 60% - see also bug 1830641