Firefox 35.0.1 I've noticed a change in behaviour for bookmarks in Firefox in the last few days. When you click on the Bookmarks menu item, a list of the various bookmark folders is displayed. If you move your mouse down onto one of those folder names, a list of its contents is displayed on the right and you can select one of those bookmarks. But I've found that recently I end up selecting bookmarks from the wrong folder. I move the pointer down to the correct folder but then as I'm moving right onto the contents, I seem to accidentally select the adjacent parent folder. Is there a configurable delay that could have got changed for this which keeps the original folder list displayed even if your mouse pointer happens to stray onto an adjacent folder in the last few milliseconds? Could a setting have got changed? It's a difficult one to describe. I have obviously got used to relying on a behaviour that has recently changed. I know the real solution is "take more care to keep the mouse on the correct folder name until it has moved off it onto the contents" but I'm curious about something that's not as it was.