Computer crashing

Go step by step and test.

1. Startup in Safe Mode:    https://support.apple.com/en-us/HT201262

    Login to your account.

    Launch Safari and test.

    To exit Safe Mode, click  in the menu bar and choose “Restart”.

For additional help, click embedded links in the article.

2. Remove website data;

    https://support.apple.com/en-gb/guide/safari/sfri11471/13.0/mac/10.15

3. If Safari doesn’t load website pages

    https://support.apple.com/guide/safari/if-you-cant-open-a-website-ibrw1071/mac

    If you can’t open a Safari window on Mac