This usually happens to me randomly. I would say that there is about a 25% chance that my paste works. The copy function seems to work, but when it comes to pasting, my browser does not offer the pasting button and it stays invisible. I have disabled my firewall, disabled my antivirus, resat firefox, started in safemode, disabled all plugins, and even uninstalled and reinstalled java. I have tried everything. This is definitely a browser problem because I am able to copy and paste in any other application with out any problem. I don't like any other browser so I refuse to do so. Please help me firefox team.