Folks. You know exactly what I'm going to say- and you already know the answers. But let me explain. I have a Toshiba Satellite laptop approx 2 years old. My preferred browser has always been FireFox.
First- The computer: For the first year when I started it it sprang to life instantly- I'd push the power button and in a matter of a couple of seconds I was signing onto my desktop. For the past year or so it now behaves like my desktops always did... push the button- listen to clicks and noises, after a minute the logo came up, etc.... about a 2 minute process. So- Why did I go from a 10 second startup to a 2 minute startup?
Now FireFox. After noticing that firefox was clogging up and bogging down and sometimes just grinding to a halt very quickly (15 minutes or so) I downloaded one of their add ons. Its a green dot that sits up at the top of the page that turns red when FF thinks the browser is getting too full. You hit the button- FF restarts- the button is green again and you're good for another 15 minutes. If you mouse over it it displays a number. When it was red that number was 520 mb. Once I came to this site the thing turned green by itself and the number is 481mb. I was on Face book simply typing replies to posts when it turned red. I usually have just one or 2 windows open.
I spent all day reading "How do I fix slow Firefox" posts on the Mozilla page- there are a lot of them. Numerous suggestions were given ranging from disabling some sort of "acceleration" whose default is always active, getting rid of add ons, tweaks to about:config, and on and on. I have opened the task manager 100 times to see what is running. most of it is turned off, and those that are turned on say they are using very little resources. By the way I checked the CPU setting and it showed a spike to 100 from a few minutes earlier.
Sorry for the long post- I believe in answering questions before they are asked to keep the ball rolling. Any thing you tell me to do can not be in general terms- I must know exactly what to do and where to do it because generalized talk about computers is Greek to me.