I'm on MacOS Sonoma 14.0. Since the Firefox update to v. 119.0, I have had a really strange issue which is hard to describe, but I'll try. In the Bookmarks Sidebar, whenever I click a folder, it disappears from view leaving a blank, empty space. The folder is still there, and everything in the folder is visible, but the folder itself is just a blank space. When the blank space is clicked on, the folder reappears and can still be selected, but the folder beneath it becomes invisible. It is almost as though the background and the foreground text and folder outline are the same color. The same thing occurs with History. The bookmarks themselves never become invisible, just the folders. Has anyone seen this behavior? Does anyone have any idea how to fix it? Thanks.