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I have a total of 8 GB of RAM and 2 GB of swap.
Reproducing the issue with a memory monitor opened, however, showed that the issue was not related to memory exhaustion: I had at least 2 GB of unused RAM at all times, and although the swap was enabled, it was not used (the swap usage remained at 0 throughout the entire period).
Also observed during this test: eight Firefox processes (seven Web Content and one WebExtensions) were running at 50% CPU usage each throughout the time of nonresponsiveness (my computer has 4 cores, so between them they were using up the entire CPU usage of the computer).