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JFYI, the problem was nailed down and worked around, see the last comments in the respective issue (https://github.com/bitwiseworks/mozilla-os2/issues/208). Please also consider reporting such things directly into the Mozilla issue system at https://github.com/bitwiseworks/mozilla-os2 as this way 1) it's guaranteed that it's noticed by the developers and 2) you get much faster feedback.So everyone, please test ESR 45 with layout.frame_rate set to 0. Here it behaves just like ESR 38 did. I will make this value a default on OS/2 for the time being.
about:config
layout.frame_rate
0