Not sure what you mean about having to search through a large number of tabs, but you can hit Ctrl/Cmd+W to close Firefox View and return to the previously focussed tab. (Ctrl/Cmd+Tab also works, as does simply clicking on the tab in the tab bar.) I ...
'Save visible' just saves what you can seen on your screen at that moment in time, whereas 'Save full page' will also save anything on the page that you can only see by scrolling the page - i.e. anything above or below the 'visible' portion of the pa...
I know that was a feature of the Arc browser, but pretty sure Firefox hasn't got an equivalent, unless it's a new feature in development, or an add-on perhaps?
I'm on Mac too, with Horizontal Tabs generally. With Vertical Tabs, the 'List all tabs' icon changes to a rectangle with a bar below it, for some reason! Can you see that, and the 'Show all' sub menu - as per image? (Obviously, if you haven't got any...
