hi DrDaveFirefox, the place to report bugs in firefox would be bugzilla.mozilla.org. however i don't think that what you've describe constitutes a bug - the "forget" dialog states that it will clear all open tabs and windows & open a new blank one.

You can use "Clear Recent History" in cases where you want to clear data from website you visited instead of using the Forget button that is actually labeled as a panic button if you would check the code and that closes all open tabs and does a lot more then you might expect.

See also:

• https://support.mozilla.org/kb/forget-button-quickly-delete-your-browsing-history
• https://support.mozilla.org/kb/remove-recent-browsing-search-and-download-history

Note that there is also "Forget About This Site" in the right-click context menu of an history item to remove data only from one specific domain. You can do that in the history sidebar and in the History Manager (Library; Show All History).

Thank you cor-el for all of the information. Very helpful.

And thank you phillipp too. I forgot what the button did -- OK, seriously I didn't read it closely enough when I first saw it and thought I knew what it did. You are right, it's not a bug (except in my brain). It's a pain to re-open the tabs I had open but I'll remember what that button does now, AND I'll know where to report a real bug if I find one.

Thank you both for the quick answers!