It looks great, but unfortunately my Firefox cannot recognize sip protocol. Is there any way how to solve this problem?

I installed the Firefox radon MeloSIP and when I click a phone number it asks if I want to open it with Skype Business. I don’t use it. It does give the option to browse for different apps to associate the Windows protocol, but I’ve no idea what I', suppose to browse to. How do you set up this thing up? I’ve no clue what an API key or other stuff means in the settings. I just want to be able to click phone numbers on the screen and dial with my connected POTS modem. Why no help files, install setup videos or information? Still, support was kind enough to contact me about it and tried to help. Here's part of MeloSIP supports email back to me...

You would require a SIP extension to initiate the calls.
Click2Call >> sennt by API to MeloTel...
MeloTel initiates call to your Ooma number...
You answer the call and it calls the number you clicked...
It would display whatever caller ID you require.
It seems unfortunately this is the only solution we could offer at this time.

4-STARS for great support!