Use more safe way to insert "Clear Downloads" menu item
Add dummy items to copy referrer and remove file from disk
(#14, #15)
Disable items to copy referrer and remove file, if nothing to do
(#14, #15)
Implement "copy referrer" command + dummy function to remove file
(#14, #15)
Implement "remove file" command
(#15)
Fix "remove file" in Firefox 24 and older
Note: tested only in Firefox 20 and 24
(#15)