Crikey! I was typing this when you replied just now!
Thank you Tech425 for your reply. I look forward to your answer.
I only very recently discovered this problem, and it's only with cyberphoenix, because previously I was using Waterfox, where there is also this problem with cyberphoenix, which motivated me to try out Firefox. That and Waterfox's massive memory leak. 'Recently discovered' means since I discovered this forum and decided to join.
glasshopper