You'll need to install Multi-OCH Helper as well. This script is only an extension, and useless on its own.

Screenshot:

Release history:

• Version 10
• Bugfixes and removed obsolete code
• Version 10.1 - Hoster list updated
• Version 10.4 - Hoster list updated
• Version 9
• Support for Firefox 57 and Greasemonkey 4
• Version 8
• Support for firedrive.com and filecloud.io
• Version 8.1 - Adjustments for Multi-OCH_Helper V10
• Version 8.2 - Removed unrestrict.li
• Version 8.3 - Nopremium.pl removed the list of available hosters from its website
• Version 8.4 - Available hosters are back again
• Version 8.5 - Small bugfixes
• Version 8.6 - Added alfafile.net
• Version 8.7 - Fixed rapidgator.net
• Version 8.8 - Design changes
• Version 8.8 - Removed some inactive hosters
• Version 8.9 - Hosters updated
• Version 8.10 - Fixed uploaded on https sites. new jquery version.
• Version 8.11 - Added uploading.site
• Version 8.12 - Fixed 1fichier.com
• Version 8.13 - Fixed some hosters
• Version 8.14 - Fixed some hosters
• Version 8.15 - Fixed updating hoster status from nopremium.pl. new jquery version.
• Version 8.16 - Fixed filefactory. Changed popup height to 200px
• Version 7
• Adjustments for Multi-OCH_Helper V7
• Version 6
• Support for mouse selections. Select some links and hover over one link to open the download button, then use "Use selected links" from the menu.

Supported links:

• 180upload
• 1fichier
• 2Shared
• 2shared.com
• BayFiles
• Billion Uploads
• BitShare.com
• CW Television Shows
• Dailymotion
• DataFile.com
• filecloud.io
• FileFactory
• Filemonkey.in
• FileOM
• FileParadox
• Firedrive
• FreakShare
• Free
• HugeFiles.net
• KingFiles.net
• Letitbit.net
• MediaFire
• MEGA
• Netload
• OBOOM.com
• Rapidgator.net
• Share-Online
• SockShare
• SoundCloud
• Streamcloud
• turbobit.net
• TusFiles
• Uploadboy.com
• uploaded.net
• Uploading.com
• Uploading.site
• UppIT
• Uptobox
• VEVO
• Vimeo
• VIP-file
• YouTube
• XERVER
• Zippyshare.com