Does the work, but it could do it even better by detecting the computer's position to set up the default region.

Also, offering a list of additionnal URI schemes (ex: "tel:") to pick from would be even better. If I didn't know that "tel:" existed, I would simply have assumed that the default "omnicall:" just doesn't work.

worked to enable Google Voice calling with any numbers, just had to set the URI scheme to "tel" and set voice.google.com as the default for the "tel" protocol in Firefox settings

It will work, if you choose the right settings: for Bria 5 I use 'tel' or 'sip' as the protocol and Europe for the region, when mostly using German websites. This works well for all kinds of numbers, but it interferes with some websites.

Some phone numbers are not recognized and a right-click menu option to select such a number would be helpful. Also excluding some sites using a blacklist would solve the problem of interference.

Давно искал для обновленного Firefox. Наконец-то всё работает!