> Safari crashes when opened
Safari in Big Sur has suddenly stopped working. Whenever I open it, the app shows its window for a split second then quits. How can I get it working again?
Although some recent Safari updates have brought problems, this isn’t one of them. It’s most likely that a new version of Safari on your Mac is crashing when it loads the Start Page, another important setting has broken, or it has an incompatible extension. Start your Mac in Safe mode, holding the Shift key, then try opening Safari. If it works normally, clear its history using that command in the Safari menu; you should be able to restart in normal user mode and use it again. If that doesn’t help, manually check and remove potential causes. Remove old or unrecognized files from the Internet Plug–ins folders in Library folders. Other locations worth checking are those inside the Safari folder in the Library of your Home folder. You can manually clear History files here, and remove extensions from their folder. If you have a custom local Start Page, check that.
Ultimately, if none of this gets Safari working again, reinstall the current version of Big Sur in Recovery mode.