Switching between tabs by swiping is usually most effective in a mobile browser since it does not have a top bar that displays all open web pages. This is mainly useful when you do not need to flip through many tabs to get to the one you need. If you have a large number of tabs open in your browser, then it will be more convenient to switch between them by calling up a full-fledged screen on which all pages are displayed.

The new feature has been added to the latest version of Firefox Nightly, which is already available for download from the Play Store digital content store. The source says that the first build of the browser, in which the code of the mentioned function appeared, was published on July 23rd. To switch between tabs by swiping, you do not need to make any settings or separately activate the function, since it is enabled by default. Just swipe left or right on the address bar to move to one of the adjacent tabs.   

Now the new feature is only available in the Android version of Firefox Nightly, when exactly it will appear in the stable version of the browser is still unknown.