Dear Maintainer,

After installing the latest security update for firefox-esr, I have noticed a bug that greatly affects the usability of the program. After a new Firefox window is opened and some time passes (it seems upwards of an hour needs to pass in order for the bug to occur), various buttons become unclickable. The "hamburger menu"/"three lines menu" becomes unclickable, as does everything else in that area of the UI (the URL bar, the icons of extensions, the forward and back buttons, etc.) Tabs remain clickable, however they cannot be moved and sorted by dragging. The buttons to close, minimize, or enlarge the window are still clickable.

Keyboard shortcuts still work, so the user will need to rely on those in order to use most features (for example, Ctrl+L is necessary to access the URL bar.)
Any new, additional windows that are opened do not have the issue of unclickable buttons. I am guessing that they too will suffer this bug if left open long enough.

I noticed that this security update changed the design of the "minimize window", "maximinize window", and "close window" buttons. Could that perhaps be related to this bug?