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Works only after configuration! Rated 4 out of 5 stars
At least for me, i had to configure the profile directory first. Otherwise it wouldn't have saved anything!!!!
This extension is AWESOME for those knowing how to navigate the filesystem and locate the profile directory. However it is rough, as in you regularly need to manually clean the accumulated files!!!!!
@Tom : as you aptly put it SessionManager serves a different purpose. This extension is a powerusers last resort solution. if all else fails, as long as you don't delete the profile directory. The urls of all open tabs are save, in plaintext.