Since upgrading to the latest firefox yesterday I am unable to switch between videos on youtube, the page info changes and shows all the details on the new video, but the video itself stays as the one currently playing. I have to refresh the page before the video changes. Also at the same time I get the following console error which repeats innumerable times TypeError: can't access dead object chrome://clickyoutubed/content/jquery-1.10.2.min.js Line 6 I've cleared my cache but still get the problem, also I have tried running Firefox 25 in safe mode with no addons running but the problem still occurs. Edited: Okay I risk looking a fool now, but problem solved... I had previously cleared my Cache and history etc but the glitch was still occurring, but just after posting the question decided to do it again to make sure. and the glitch is now gone. I am assuming maybe a cookie that didn't get deleted (despite having it set to clear cookies automatically on exit) was the cause of the problem. me/ Exit stage left looking like a prat.