I am also using Mojave 10.14.4. I wasn’t suggesting the app doesn’t work.
The screen shot that I provided was taken after I installed the extension.
If you DL the free What font app from the Apple App store it installs successfully. You have to enable the extension before you can use it.
To do so you click on Safari preferences - you get a tab bar. The screen shot shows those
areas. Clicking on Extensions tab reveals my concern with the app claiming these permissions.
The app after installing gives itself the ability to read from all web sites sensitive information from web pages, passwords, phone numbers and credit cards. Reading that induced a shiver.
Apparently you do not get the same info from the Google Store. @Whittefield mentioned 1,700 reviews on Google app store the Apple Mac store has 10 reviews with a 4.5 rating.
I have no idea where to check permissions on OSX. So I contacted Apple Support this afternoon.
I spent over an hour on the phone with Apple regarding this. They kept asking me questions about the screenshot and finally agreed to let me send the screenshot. It was escalated three times during our conversation. They could not believe what they were seeing which was my reaction.
They assigned a senior technician help me “scrub thru the machine”. It appears that my machine is clear of any virus’ malware and other installs. They made it clear that once this was complete the case is closed and I will not know what happens with the developer since it is another case with the App Store and developer.
My sole purpose was to share what I saw regarding this extension with the forum and those that provided me with help regarding my request.