Installed Safari Extensions disappear after restarting Safari I have a problem with my Safari. I can not install any extensions. Whenever I install one they work fine, but the next time I open Safari, the extension is not there. So I have to reinstall them at every launch.

I have tried to clear my Safari stuff, like plists and Library folders. Im using Safari 8.0.1.
Is the login keychain locked or otherwise inaccessible? Apple now stores the list of installed Safari extensions in that keychain. See the link below for more details:

Deploying &amp; Installing Safari Extensions on Safari 6.1+ &amp; 7.2+