This is REALLY starting to %$^#$# annoy me!! Using FF 43.0.4, copying plain text (comments) in Facebook. When I press Ctrl-V to paste either nothing is pasted OR the text is pasted twice!! Extremely frustrated!! I've tried the about:config 'trick' - did not solve the issue. And *NO* - I'm not going to mess up my FF settings, addons, etc in a vain attempt to solve this. Easier to dump FF and start with another browser (it's not like FF doesn't have any competition....) Copy / paste has been around almost as long as computing itself - why, after what, 30+ years, is FF unable to support so basic a function consistently from version to version??? Don't they do ANY testing before release?? NOT GOOD ENOUGH!! :( Philip Bannor