Why has my Safari browser suddenly stopped working completely?

Safari stopped is one of the most common problems encountered by users. Safari may fail to respond for a variety of causes, resulting in crashing or freezing. When users are unable to launch Safari even after the reset, the problem becomes more complicated.

1. There are too many tabs open.
2. There is an excessive amount of cache, downloads, and history logs that haven't been cleaned in a long time.
3. Safari is crashing or freezing due to an extension, plugin, or webpage you're visiting.
4. Safari has become obsolete.
5. An older version of macOS is available.