At first I thought it was a facebook problem, but the issue started appearing in other places (gmail, youtube, etc). I can be writing something in a comment box, word doc, chat window or whatever and if I select some text and hit copy or cut, the entire browser absolutely locks - can't click on anything or do anything - for MINUTES at a time. There's no CPU, disk read/write, or other system usage spike to indicate what's going on - Firefox just stops and is completely unresponsive for a very long time. This is new as of the past couple weeks, I think? I hit it once and didn't think much of it but now I'm getting hit by it daily just about because I'm more active on social media, email, and other things lately. wtf? I have not installed any new extensions in a very long time.