Autohide in Firefox 52 ESR

[ribatamu]

I have vertical toolbar 1.0.17 and Firefox 52 ESR.

In the vertical toolbar option I changed:

• the placement to right side;
• normal:auto hide;
• uncheck always show the toolbar while the sidebar is open.
  Everything else by default.

When I start Firefox and move the cursor to the right edge, the vertical toolbar is showing up and then is closing, like should be. But sometimes is not hiding properly and I see the edge of the toolbar like is in the screenshot.

I tried to add different shortcuts. The problem only occurs when I put shortcuts, which have drop maker, like is in the screenshot s2.jpg. I tried a few shortcuts with this drop maker and all have this problem. If the shortcut is without this drop maker, the autohide is working like should be. In the screenshot s1.jpg you can see the toolbar is not hiding 100%.

[ribatamu]

I think the problem is in the option showing/hiding animations.