Download History Cleaner is the easiest way to clear your browser download history for a specified period. You can define custom time on the options page. Also, you can define the area (zone) in which you want the data to be cleared.
For a more comprehensive cleaner try my eCleaner
https://chrome.google.com/webstore/detail/ecleaner-forget-button/ejhlpopncnfaaeicmbdnddebccnkfenn
Using this extension it is possible to wipe download 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:
https://add0n.com/ecleaner.html?from=downloads-cleaner
Very good and useful extension. I used it on Opera Beta for a long time and it does exactly what I expect it to do! I strongly recommend it those who download many files simultaneously and the downloads bar gets filled quickly.