I do with new app with extension but nothing .can you just download and reinstall it?
Not safari extension is the third-party extension of systemyou redownloaded the EXTENSION? check here: Home>Library>Safari>Extensions. if the extension is there, OPTION-drag it to the desktop, and reinstall it... if it's NOT there, you have to find it online again...
Not safari extension is the third-party extension of system
Ok , but this problem appair in 2 month ago . So , i do an update of capital 10.11The extension code may not be allowed by SIP.
You may have to wait for an update.
The problem not at calcul but on all new app with third-party not appear on the extension . For exempl i have iStat mini but not appear on table of extensionwhen i look at my extension window, only 3rd party apps show in 'All'. have you tried using the "Edit" button at the bottom of the Notification window? that's where the option to turn on, for example, Calculator, is...