I am one of the worst offenders of the "keep the tabs open variety". I have several hundreds of them open for months on end. For this rather unusual browsing habit, no other browser other than FF works for me. FF does fine even on my 512MB Pentium-M laptop, Chrome for instance will make such a box unusable . Am somewhat relieved/piqued to see that this behavior is not unique. I have been asked to defend my habit many…
Panorama / Tab groups are amazingly helpful for this, one of the best FF4+ features. This is another good step towards improving the feature. I'm not sure how well the Dropzilla concept will work with a large number of bookmarks, or folders within folders, but I look forward to testing whatever they come up with.
The Tab Groups feature is really useful but it's also quite awfully done. I particularly hate the way it resizes and moves around groups when you resize the browser. Ideally, it should use an automated layout, similar to tiling window managers, where you have a fixed master area, and a stacking area for other recently used groups. It'd also be fairly handy if you could nest groups, or have multiple panoramas, for people like me who have too many tabs open to fit on the screen at once.