Allow background image for tab position
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In recent Vivaldi versions the function is linked to speed dial background image and the panels - which is nice - but I preferred the old [independent] behaviour which allowed a bit more customization.
By the way, not every image is suitable for the different tabbar layouts so allowing a specific image - one for vertical and another for horizontal layout - is the safer long term choice. Then it should respect the themes settings, especially the blur and the transparency. -