it depends on what you need to do. Generally, you can make a direct link for the clipboard on windows (eg. in your Desktop) through linking to the relevant .exe file located on System32 folder (C:\Windows\System32\clipbrd.ece or something like that).
If you need to do it through Firefox, you could easily search for an Add-on that does the job for you: Related Extensions
If you need to do something more complex like using clipboard contents for a web application you should give us more details so as to be able to help you!