Cleans your history by removing visits from a list of domains you provide as either a whitelist or a blacklist. So it's black and white, like a Zebra.
What is History Zebra?
History Zebra is a Firefox add-on that allows you to clean your browsing history by removing visits from specific domains. You can create a whitelist or a blacklist of domains to customize the cleaning options. With History Zebra, your browsing history can be kept clean and organized.
After first installing this addon you must go to the settings page via about:addons and create your list of domains.
History Zebra is relatively safe to use as it requires very minimum permissions.
History Zebra has earned a fairly good reputation and likely can be trusted.