No. That doesn't work.

My experience of Firefox on a laptop (all versions; I'm using 3.5.4 now on Ubuntu 9.10), is that open pages sometimes consume a lot of power.

Many pages are static and should consume no power at all when not actively being used. But a disturbingly large number of pages have enough Javascript and/or flash and/or animations running that if I ever see my CPU using 50% or more and I'm not doing anything, it's nearly always Firefox using it on another desktop.

There's not a lot it could do about that, unless you want it to freeze script activity in windows that haven't been used for a whlie and/or are not currently visible.

Anyway, for that reason, I sometimes find myself quitting Firefox as a whole when I need to conserve battery on my laptop, and restarting it when I need to browse some more. The "restore all tabs and windows" feature is invaluable for that.

It doesn't help that you can't tell which pages are causing the CPU consumption, except closing them one by one, so that makes it hard to be selective.

And that's why "just keep all your windows open" won't work - unless they have found a magical way to stop excessive CPU consumption of all web pages.

Of course, I don't really need these 50 tabs open all the time. It'd be fine to have something more like "currently in use" bookmarks that behave _similar_ to open tabs & windows in keeping a large rendering of the page to hand, as the position in the page I was looking it, so I can flick through them to remind myself what of active items I'm researching, but with scripting activity inactive. (Bookmark titles don't work - titles are often useless as reminders of just _why_ I put some page aside while working on something else). I haven't found a bookmarking plugin thats suitable for me, for Firefox yet, but hold out hope still. Maybe it's built into N900 already? ;-)