The usage of memory keeps rising even though I'm not opening more Tabs. I need to see a page showing, in rank order, the memory committed to each Tab. Also how that amount varies. It would be useful to have a function where I can close a tab to release the memory, but keep the URL on a "sideboard" so I can open it easily -- I don't want to put it into bookmarks, nor have to search thru bookmarks (I would have to remember the site's name to do that).