Hi nordvie, You can open your History Library by pressing Ctrl+Shift+H. Right-click on the item that you wish to delete and select Delete Page.

Note that you can also do this in the sidebar (Ctrl+H; sort "By Last Visited").

Can I select a number of history lines and delete them all at once? Basically I want to keep only a few lines of dozens daily.

Many thanks to both of you! Is there a "click path" to get to ctrl+shift+H? I've been using FF for about 20 years, and it keeps on getting more and more opaque. I wish there was some interface to do things "the old way." Old dogs and new tricks ...

Question #1 - Sure. Select an upper line, press and hold Shift, and select a line lower down. Right-click and select Delete Pages. Or, selectively, hold the Ctrl key and click on the desired items in the list, again, right-click and select Delete Pages.

Question #2 - Click the Library icon on your toolbar, select History, at the bottom click Show All History.

Question #2 - Click the Library icon on your toolbar, select History, at the bottom click Show All History.

Under History, there is no selection available Show All History.

It should be all the way at the bottom - you might have to scroll down to the end of the list to see it.

This might come in handy for you also: Forget button - quickly delete your browsing history on Firefox

Note that the Forget button can be quite dangerous (as a start it closes all open windows and opens a new window), so always use this with care.

Thanks for the heads up. I'll stick now to my earlier decision to only try that feature in an isolated context.