A few months ago, I noticed that Firefox has become very slow. When I looked at my task manager a minute ago, it showed 2,500 MB of memory usage and very high power demand after I had opened only three websites plus yours. I took the computer - a desktop using Windows 10 - to a technician who took $140 to tell me that he "cleaned it up and everything should be faster now." It is not any better for it. How can I get my computer to work in Firefox as well as it does in Edge? Thank you, Barry