The "swipe-left" gesture on the tab card that sends the link to flow is very counter intuitive and is not following all the other web-browser app. It's too easy to send a link to Flow involuntarily..

I would suggest, instead, to use a less common gesture (i.e. double-tap) to do that or a context menu with that option and definitely keep the scrolling left & right to remove the tabs and the up & down to move through them.