These crashes happen consistently under these conditions. If I extract the zip file anywhere on drive (E:) besides the Downloads folder, it'll extract without issues. If I extract the zip file into the Downloads folder without firefox being open. it'll extract without issues. If I use the built it Windows Explorer zip extractor instead of 7zip, it'll extract without issues even if firefox is open and it's extracted into the Downloads folder. And of course certain zip files just work without issues at all.