Mozilla's Analytics aren't disabled in about:addons > Get Add-ons

Open network observer with Ctrl+Shift+Q to see the traffic then go to about:addons > Get Add-ons and you should see Google analytics' analytics.js load there (assuming Low or Medium security setting).

Shouldn't it be disabled entirely in about:addons?

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information