I've noticed that the back button history (when you click the tiny down arrow to the right of the back button) sometimes isn't dismissed when a selection is made from it. One way to reproduce this every time is: i) get a bit of browsing history so you actually get a history menu ii) click and hold on the "show back history menu" arrow. The menu appears - keep holding. The menu should flash for a split second; it's now 'stuck' and you can move the main window around independently from the back menu. The only way to get rid of the menu is to actually click on one of the history states. (see attachment for screencapture)
Confirmed using FizzillaCFM/2002061014. See also bug 137201 and bug 101472. Reassigning to XP Toolkit/Widgets: Menus and reducing Severity to Minor since the workaround is to dismiss the pop-up menu with the escape key.
There are two bugs here. (1) When your computer is trying to do lots of stuff at once, Mozilla thinks that a click is a click-and-hold. That's bug 117589. (2) When you do a click-and-hold on the Back menubutton, one copy of the Back menu opens because you clicked on the menubutton, and another copy of the menu opens because you clicked-and-held on the Back button (which includes the menubutton). That's bug 102330. Then when you choose an item from the frontmost copy of the menu, the other copy stays behind. *** This bug has been marked as a duplicate of 102330 ***
mass duplicate verifications . For filtering purposes, pls use keywd "massdupverification"