Zen Stable Release

Fixes

Fixed compact mode toggle being appear checked incorrectly (#12973)
Zen now respects more 'reduce motion' system settings to disable or simplify non-essential animations
Switching spaces will not be blocking anymore, meaning you can switch to another space while the current one is still animating (#8206)
Fixed website notifications not being clickable when using the right sidebar (#12104)
Improved low-FPS performance on certain occasions, such as when playing videos or using glance on low-end devices (#12979)
Fixed restoring a pinned tab also scrolling the website to it's original position (#13024)
Fixed some toolbars having unreadable text colors when using certain themes (#13024)

Reverted to Firefox's old search bar due to compatibility issues with the new one
Context menu for split tabs has now been renamed to 'Join tabs' to be more intuitive