iTunes protocol handler on Linux with Wine

Today I have tried adding my PayPal account to my iTunes (installed with Wine) Account but discovered, that adding my PayPal account as a payment method didn’t work. After inspecting the network traffic, I found that my browser (Firefox) was redirected to an itmss:// URL, but Firefox didn’t know how to handle that and did nothing. To get it working yourself, follow the next steps: Assuming you already have iTunes installed and are using Firefox, open about:config in Firefox, accept the prompt, right-click and select New -> Boolean....