Active tab highlighting stops working after moving to another window
To reproduce:
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When working with two browser windows open, drag and drop one or more tabs from one window to another.
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Click on any of the newly moved tabs. The tab will open, however it will not be highlighted as an active tab - instead, the previously active tab will still be highlighted.
The issue persists even after switching back and forth between tabs - the ones that have been moved from another window will always have no highlight. The only way I have found to restore the highlighting is to completely restart the browser.
UPDATE - Seems that it is not just the highlighting that is broken, trying to open a link in a new tab (from a moved tab) stops working also.
Using Firefox 59.0.2.