Just recently Firefox has started to negatively affect my network connection, seemingly only after video playback has happened. Every fix to six pings the time jumps up from the normal range (less than 100ms) to 2-3,000 ms and then returns to normal. This only happens with Firefox and seems to happen mostly when/after video playback has happened but can also happen without video playback. I have started FF without addons as well as in Safe Mode and it still occurs. As soon as I close FF the ping returns to normal and network stability resumes.