Q: Safari 10.0 Issues

Hi ...

Possibly due to Safari extensions or third party plug-ins.

Troubleshooting help here > Safari: Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues

Didn't they test this before releasing or are we the beta testers?

Yes but that doesn't apply to third party Safari add-ons.

Ok ..  then you still need to troubleshoot third party plug-ins. The instructions are here >  Safari: Unsupported third-party add-ons may cause Safari to unexpectedly quit or have performance issues

Safari/Preferences/Advanced - enable the Develop menu, then go there and Empty Caches. Quit/reopen Safari and test. Then try Safari/History/Show History and delete all history items.  Quit/reopen Safari and test. You can also try try Safari/Clear History…. The down side is it clears all cookies. Doing this may cause some sites to no longer recognize your computer as one that has visited the web site. Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J.  When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder.  Select Library./Caches/com.apple.Safari/Cache.db and move it to the trash.

Safari Corruption       See post by Linc Davis

You are welcome.

Did you download it from here?

Adobe Flash Player

Did you check Safari/Preferences/Security to make sure Allow plug-ins is checked? If you click Plug-in Settings, is Flash Player enabled?

Did you try the other steps in my first post?