I have been using Firefox for quite a long time but this problem, i am facing just now. When i try to copy the url in firefox browser it wont get copied easily instantly. After highlighting and pressing ctrl+c for many times only it gets copied and i can post.
It wors fine with other browser i have; chrome,IE 10. What can be the reason? I have uninstalled and installed again but still the same problem.Even the browser is up to date.
something else you can try, delete firefox and make it clear its preferences, download ccleaner and run the files cleaner then run its registry cleaner multiple times till it finds no errors. see if this helps.