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Why secondary monitor in Fullscreen mode hides dock on primary monitor when Firefox is focused ?

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Hi everyone,

I'm using the lastest version of Firefox with the lastest version of Mac OS X High Sierra. I have a dual screen setup and my main monitor is on the right side. I usually watch Twitch or Youtube in fullscreen mode on my secondary monitor (the left one) while i'm browsing the web on another Firefox window on my main monitor.

The problem is, as soon as I enable the fullscreen mode on Youtube (on my left secondary monitor), the dock and the menu bar get hidden somehow on my main monitor which is NOT in fullscreen mode. When Firefox is focused either on my main monitor (web pages) or my secondary monitor (video stream such as Youtube), the dock and the menu bar stay hidden. To get them back, I have to focus the desktop or any other application that Firefox.

You might suggest me to check "Automatically hides dock" in dock settings, but even when this setting is checked, the dock is not even showing up when I put the mouse at the bottom of the screen when Firefox is focused. I have to focus the destop or any other application to make it work.

Any help? Thanks a lot :)