It is now possible to disable Tab Fading for sleeping tabs in Microsoft Edge.
In recent Edge updates, Microsoft added a nifty feature called Sleeping Tabs. It freezes used tabs to preserve resources, free up some memory and reallocate it to more important tasks. Whenever a browser freezes a tab, it fades away. This helps a user to distinguish a regular tab from a sleeping one. Some people may find this behavior slightly confusing (especially considering that it is on by default), so there is a new feature to disable tab fading in Edge.