At present when dragging to resize the main firefox window, the toolbox search box and URL bar resize in a smooth progression, which is great. However if you make the window quite narrow i.e. dragging the right edge over to the left, then what happens is some of the add-on toolbar icons are hidden to make room. This happens instantly and so has the effect of then resizing the search box and URL bar again, the combined effect is that as you drag the window to be smaller or larger everything jolts left and right as if having some kind of seizure as different icons appear/disappear. I don't know what the best solution to this would be, but there must be a better way. Maybe a flexible space that uses up the equivalent of one icon that will squeeze and expand such that removing an icon will never suddenly make the search box and URL bar larger, so you then have a smoother change in size. [ico][ico][ico][ico] [spc][ico][ico][ico] [sp][ico][ico][ico] [s][ico][ico][ico] [][ico][ico][ico] So as the window/toolbar gets smaller, first you replace the leftmost icon with the space placeholder, then make that space smaller until it is zero, and then you replace the next icon with a space placeholder and so on. The code for this probably exists already for the flexible toolbar space, so perhaps it just needs to be re-used as part of whatever routine is adding and removing toolbar icons on a resize.
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