The number of tabs you have doesn’t correlate to the number of active web views you have, if you use any browser that unloads background tabs while still saving their state.
Those are the type of "I'll go back later to it", The workflow on modern browser is broken. Instead of leveraging the bookmark functionality to improve the UX, we have this situation of user having 50+ tabs open, because they can. It takes quite a bit of discipline to close down tabs to a more manageable numbers.