For the OLD system in KM1.5-1.8, there's a rescue macro by JamesD somewhere in the forum now. Like mine too, it works fine, but can only save line by line by line by line by.... ouf.
For 100+ tabs on a old and slow machine that can get a bit tedious, so here's an alternative way, fixing the crashed session in prefs.js via Notepad. Still tedious too, but just one writing action:
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Bugs