Let’s assume you are using Mobile Firefox with a “Swipe toolbar sideways to switch tabs” option enabled. You have opened three tabs (Mozilla, Wikipedia, and Github respectively). So when you are on the 2nd tab (Wikipedia), you can swipe from right to left to get to the 3rd tab (Github), and you can also swipe from left to right to get to the 1st tab (Mozilla). But when you are on the 1st tab (Mozilla) you can only get to the 2nd tab (Wikipedia), while swiping from left to right will get you nowhere. The same is with the 3rd tab (Github), from which you can get only to the 2nd tab (Wikipedia), but not to the 1st one (Mozilla).
I would like to suggest to make it also possible to switch through swiping toolbar from the 1st tab to the last one, and backwards from the last tab to the 1st one. Or other words make looped tab switching possible: 1 – 2 – 3 – 1 – 2 – 3 – 1...
Thank you.