Est. Budget: $1,000.00
Attached pdf gives more detailed specification
You should have built a crossrider browser which makes page embedded phone numbers and URLs clickable, can play a short WAV audio file and can invoke a .dll written in C embedded with the extension.
If this is not possible with the crossrider extension development environment, let me know that and how you would create a cross browser extension which can invoke a .dll.
Solution should work across top 4 major browsers as defined ...