I 'Copy & Paste' from within Firefox quite often but for some reason the function has stopped working when using some sites, even the menu item 'Paste' is greyed out, yet I can open Notepad and 'Paste'. I tried pasting into 'Notepad' then copying from Notepad and pasting back into Firefox, which I've found in the past sometimes works but today even that does not work. I accept it may not actually be a Firefox problem but I have noticed since upgrading to the latest version, I am having several problems with crashing and hanging exceedingly long execution of the browser.