This is similar to this question: (firefox-making-white-flash-as-it-builds-the-page) But the difference is that in my situation, that page is already fully loaded.
Well after the page has fully loaded, on certain javascript events that trigger adding elements to my page, Firefox produces a white flash (not over the entire page, but not on the specific div where the elements are being added) covering a large area of the page (basically it happens to an ancestor of the div I am adding content to, but it is not the direct ancestor).
The elements I'm adding are in a horizontally scrolling div, so its not like the page width gets changed at all. Also, it is not consistent. Sometimes the adding or removing elements triggers the white flash, and other times it does not.
I'm assuming this is just an issue with the way FF redraws the page.
I know my question may be a little vague, but I wasn't sure if anyone has had experience with this or has any suggestions. Any advice would be much appreciated.