add a feature to whitelist or blacklist specific sites

It removes the requests from the history, but does not clear cookies or any other private data.
This might be what you want, I will look for something different.

Yes, Its a similar system as "keep history up to specified number of days". Or it can do by manually and this extension have to assist more fixed alert. So make it action to clean automatic at specified web based links. So that I can keep other links in history ! If not need, the listing will empty.

It says history will be deleted after about a minute of no activity on Firefox. Very vague.

1. What is no activity? If I'm streaming a radio station, is that activity? If an app is constantly going out to look for new messages or something is that activity? If I run multiple profiles, must they all be inactive?

2. I would much rather be able to
a. Turn off the automated deletion (ON/OFF, not just setting days to ZERO).
b. Have a button to manually initiate the deletion.

В Firefox есть встроенная функция для удаления, автоматически, истории, кэша и всей остальной информации при закрытии браузера.