That's the fastest way to get back to those pages. You can use the Scrounger tool to save the recovered tabs as a web page of clickable links.
There aren't any programs that can 'open' recovery.baklz4 it's purely meant for Firefox to use if it has a problem with recovery.jsonlz4.
However, it did have a History menu on the optional menu bar - tap the Alt key to activate the bar if you don't normally display it.
Hi TeresaRudolph71, Firefox 56 didn't have a Library button, that was added in Firefox 57.
