Cursor arrow changes to a hand on long click but doesn't revert to arrow

[Scribe-uk]

When long left clicking a link, the cursor arrow changes to a hand icon but doesn't revert back to an arrow after the link has opened in a new tab. It will only revert to an arrow if the hand is moved to the Firefox toolbar.

Settings:
Long left click - selected
Open links in background - not selected
Open in - new tab
Long left click timeout - 300ms
Right click - not selected
Handle clicks on images - not selected
Mouse move tolerance - 14 (default)
Debug mode - not selected

Win7 Home Premium. Firefox 66.0.5

This has also been mentioned in a review by 'circcc'

It's quite a minor bug but does get a little irritating so hope there is a fix for it.

Thanks :-)