Clearing cache does not seem to do much. As an experiment, I cleared the cache using the Tools | Clear Private Data | Cache box is the only item checked and Task Manager showed memory went from 255 MB up to 260 MB after clearing.
It’s now at 262 MB after composing this message. In fact, if I stop typing and watch the memory usage, it climbs at a rate of 1 MB a minute.
Jack
My system reports FF using 199m. I have two browser windows open, and a total of about 30 tabs. But no change in memory usage on it’s own. Now I have noticed that when I open up other windows and then close them down, they do not return memory, but no creep on its own as mentioned. Now that might be the difference between running in windows vs Linux. I’m running in the latter.