拡張機能「 History Cleaner (History Eraser)」

History Cleaner is the easiest way to clear your browser history for a specified time period. You can define custom time period in the options page. Also you can define the area (zone) in which you want the data to be cleared from.

For a more comprehensive cleaner try my eCleaner
https://addons.opera.com/extensions/details/ecleaner-forget-button/

Using this extension it is possible to delete history of three different zones:
1. Normal websites,
2. Protected websites,
3. Extension zone

Definitions:
-> Extensions zone: Extensions and packaged applications a user has installed
-> Protected websites zone: Websites that have been installed as hosted applications

For bug reports please visit:
https://github.com/andy-portmen/ecleaner

For FAQs please visit:
http://add0n.com/ecleaner.html?from=history-cleaner

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