While I agree that it would be ideal if we could clear out the gunk in FF without an extension, it’s clearly not ever going to happen. Same browser after a 3 second restart: 198MB. I keep a little restart button right next to my back button and hit it every once in a while. So yeah, that is a 12% reduction in memory usage, but I still do much better with the restartless restart extension. It was using 1,015MB in task manager before. There's no painful tradeoff to make here.I just tried using all 3 of the free memory buttons on a FF instance I had open for about 45 minutes. If you're thinking, "I want that RAM free now so I can use it later", forget it. If you had 1GB free for the last hour, you gained no benefit whatsoever from that 1GB in that past hour. Modern operating systems go out of their way to have as little free RAM as possible. They certainly don't do work that they'll probably just have to undo later. Smart systems only expend effort when there's some expected benefit. Freeing and allocating memory takes effort. At a minimum, it allows Firefox to use up to 2GB of memory without having to allocate any more memory, which is a win.
It's perfectly reasonable if the alternative is to have some of that RAM be wasted and holding no data whatsoever. The fact is that firefox sometimes uses upto 2Gb of memory which does not seem reasonable for the number and content of tabs being open. It is not returning to the initial level because it would take effort to do so and there would be no benefit to expending that effort. So, simply put, Firefox is using more memory because the alternative would be to waste that memory. A system with 8GB of RAM can't use 4GB today in order to use 12GB tomorrow. Your only choices are to use it or waste it.
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