I'm using Tabs Outliner on both Chrome and Chromium on my KDE Debian GNU/Linux platform - and while it's really helping to quell my rampant tab addiction, I still have a few dozen windows with multiple tabs, during most sessions.
The problem is that both Chrome and Chromium appear to crash on shutdown more often than not - this may well be a KDE problem, perhaps just not giving enough time for the apps to sanely quit - but I can't say for sure. On startup all my Chrom* windows & tabs are restored automatically (no 'the app crashed on the last run - do you want to restore tabs?' option is given).
In either case, it's quite a pain to go back through the history of crashed sessions and collapse & delete them individually.
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