Can anyone help me fix this behavior?

Hello, After a combined Windows and Firefox update, my sidebar panel that I use to access my tabs and other extensions primarily sits behind the webpage itself. I can still see my tab icons, and when I hover over it to expand I can see that it does in fact expand, but the information is displayed behind the current webpage. I've attached a couple images to show what I mean. In the first image it shows how it normally would look, just the tab icons. In the second it shows how it is behind the webpage. You can see the start of the tab names and at the top you can see that it's expanded, as it's covering the previous, next, refresh buttons. The sidebar extension for the tabs is called Sidebery. Can anyone help me fix this behavior? Thanks.