Google acquires Video DownloadHelper. More details here
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The documentation in this page is only relevant for DownloadHelper 4.0 and above
The history allows to remember the videos you have watched and eventually downloads some of them as a batch operation.
Check for the feature to be enabled.
Clear history on exit
If checked, when leaving the browser, the history is cleared. Note that if you uncheck the parameter and watch many videos on a a given period, this might seriously slow down your browser startup.